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    Which mvel2 jar version?<br>
    <br>
    Provided that the mvel version is correct, it looks like the real
    exception gets eaten...<br>
    <blockquote type="cite">
      <div>Caused by: java.lang.NullPointerException</div>
      <div><span style="white-space:pre-wrap"> </span>at
        java.lang.String.&lt;init&gt;(Unknown Source)</div>
      <div><span style="white-space:pre-wrap"> </span>at
        org.mvel2.util.ErrorUtil.rewriteIfNeeded(ErrorUtil.java:12)</div>
    </blockquote>
    If that's true, we need to open a jira. Pinging Mario on this.<br>
    <br>
    In any case, the exception message should be much clearer as to
    what's the problem is.<br>
    <br>
    <div class="moz-cite-prefix">Op 28-01-13 16:51, Andr&eacute; Fr&oacute;es schreef:<br>
    </div>
    <blockquote
cite="mid:CAC8f_wVfcf17EQcUXiaiPk9wYw4V1wm8paX3r9=SzyNB_7qn6w@mail.gmail.com"
      type="cite">
      <div dir="ltr">5.5.0.Final both</div>
      <div class="gmail_extra"><br>
        <br>
        <div class="gmail_quote">2013/1/28 Geoffrey De Smet <span
            dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:ge0ffrey.spam@gmail.com" target="_blank">ge0ffrey.spam@gmail.com</a>&gt;</span><br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div bgcolor="#FFFFFF" text="#000000"> Which version of
              planner (drools-planner-core) and drools (drools-core,
              drools-compiler)?<br>
              <div>Op 28-01-13 16:40, Andr&eacute; Fr&oacute;es schreef:<br>
              </div>
              <div>
                <div class="h5">
                  <blockquote type="cite">
                    <div dir="ltr">I'm comparing both the example and my
                      implementation, can't see anything different from
                      each other except that example uses that
                      CloudBalancingGenerator. Even the drl rule remains
                      the same, i wrote it and then fixed the errors
                      until reach that point.</div>
                    <div class="gmail_extra"><br>
                      <br>
                      <div class="gmail_quote">2013/1/28 Andr&eacute; Fr&oacute;es <span
                          dir="ltr">&lt;<a moz-do-not-send="true"
                            href="mailto:arfmoraes@gmail.com"
                            target="_blank">arfmoraes@gmail.com</a>&gt;</span><br>
                        <blockquote class="gmail_quote" style="margin:0
                          0 0 .8ex;border-left:1px #ccc
                          solid;padding-left:1ex">
                          <div dir="ltr">this is the full drl file:
                            <div><br>
                            </div>
                            <div>------------</div>
                            <div><br>
                            </div>
                            <div>
                              <div>package com.swa.planner.domain.rule;</div>
                              <div><br>
                              </div>
                              <div>import
org.drools.planner.core.score.buildin.hardandsoft.HardAndSoftScoreHolder;</div>
                              <div>import
                                org.drools.planner.core.score.constraint.IntConstraintOccurrence;</div>
                              <div>import
                                org.drools.planner.core.score.constraint.ConstraintType;</div>
                              <div><br>
                              </div>
                              <div>import
                                com.swa.planner.domain.CloudBalance;</div>
                              <div>import
                                com.swa.planner.domain.CloudComputer;</div>
                              <div>import
                                com.swa.planner.domain.CloudProcess;</div>
                              <div><br>
                              </div>
                              <div>global HardAndSoftScoreHolder
                                scoreHolder;</div>
                              <div><br>
                              </div>
                              <div>rule "requiredCpuPowerTotal"</div>
                              <div><span style="white-space:pre-wrap"> </span>when</div>
                              <div><span style="white-space:pre-wrap"> </span>$computer

                                : CloudComputer($cpuPower : cpuPower)</div>
                              <div><span style="white-space:pre-wrap"> </span>$requiredCpuPowerTotal

                                : Number(intValue &gt; $cpuPower) from
                                accumulate(</div>
                              <div><span style="white-space:pre-wrap"> </span>CloudProcess

                                (</div>
                              <div><span style="white-space:pre-wrap"> </span>computer

                                == $computer,&nbsp;</div>
                              <div><span style="white-space:pre-wrap"> </span>$requiredCpuPower

                                : requiredCpuPower),</div>
                              <div><span style="white-space:pre-wrap"> </span>sum($requiredCpuPower)</div>
                              <div><span style="white-space:pre-wrap"> </span>)</div>
                              <div><span style="white-space:pre-wrap"> </span>then</div>
                              <div><span style="white-space:pre-wrap"> </span>insertLogical(new

                                IntConstraintOccurrence("requiredCpuPowerTotal",

                                ConstraintType.NEGATIVE_HARD,</div>
                              <div><span style="white-space:pre-wrap"> </span>$requiredCpuPowerTotal.intValue()

                                - $cpuPower,</div>
                              <div><span style="white-space:pre-wrap"> </span>$computer));</div>
                              <div>end</div>
                              <div><br>
                              </div>
                              <div>rule "requiredMemoryTotal"</div>
                              <div><span style="white-space:pre-wrap"> </span>when</div>
                              <div><span style="white-space:pre-wrap"> </span>$computer

                                : CloudComputer($memory : memory)</div>
                              <div><span style="white-space:pre-wrap"> </span>$requiredMemoryTotal

                                : Number(intValue &gt; $memory) from
                                accumulate(</div>
                              <div><span style="white-space:pre-wrap"> </span>CloudProcess

                                (&nbsp;</div>
                              <div><span style="white-space:pre-wrap"> </span>computer

                                == $computer,&nbsp;</div>
                              <div><span style="white-space:pre-wrap"> </span>$requiredMemory

                                : requiredMemory),</div>
                              <div><span style="white-space:pre-wrap"> </span>sum($requiredMemory)</div>
                              <div><span style="white-space:pre-wrap"> </span>)</div>
                              <div><span style="white-space:pre-wrap"> </span>then</div>
                              <div><span style="white-space:pre-wrap"> </span>insertLogical(new

                                IntConstraintOccurrence("requiredMemoryTotal",

                                ConstraintType.NEGATIVE_HARD,</div>
                              <div><span style="white-space:pre-wrap"> </span>$requiredMemoryTotal.intValue()

                                - $memory,&nbsp;</div>
                              <div><span style="white-space:pre-wrap"> </span>$computer));</div>
                              <div>end</div>
                              <div><br>
                              </div>
                              <div>rule "requiredNetworkBandwidth"</div>
                              <div><span style="white-space:pre-wrap"> </span>when</div>
                              <div><span style="white-space:pre-wrap"> </span>$computer

                                : CloudComputer($networkBandwidth :
                                networkBandwidth)</div>
                              <div><span style="white-space:pre-wrap"> </span>$requiredNetworkBandwidthTotal

                                : Number(intValue &gt;
                                $networkBandwidth) from accumulate(</div>
                              <div><span style="white-space:pre-wrap"> </span>CloudProcess

                                (</div>
                              <div><span style="white-space:pre-wrap"> </span>computer

                                == $computer,</div>
                              <div><span style="white-space:pre-wrap"> </span>$requiredNetworkBandwidth

                                : requiredNetworkBandwidth)</div>
                              <div><span style="white-space:pre-wrap"> </span>sum($requiredNetworkBandwidth)</div>
                              <div><span style="white-space:pre-wrap"> </span>)</div>
                              <div><span style="white-space:pre-wrap"> </span>then</div>
                              <div> <span style="white-space:pre-wrap">
                                </span>insertLogical(new
                                IntConstraintOccurrence("requiredNetworkBandwidth",
                                ConstraintType.NEGATIVE_HARD,&nbsp;</div>
                              <div><span style="white-space:pre-wrap"> </span>$requiredNetworkBandwidthTotal.intValue()

                                - $networkBandwidth,&nbsp;</div>
                              <div><span style="white-space:pre-wrap"> </span>$computer));</div>
                              <div>end</div>
                              <div><br>
                              </div>
                              <div>rule "hardConstraintBroken"</div>
                              <div><span style="white-space:pre-wrap"> </span>salience

                                -1</div>
                              <div> <span style="white-space:pre-wrap">
                                </span>when</div>
                              <div><span style="white-space:pre-wrap"> </span>$hardTotal

                                : Number() from accumulate(</div>
                              <div><span style="white-space:pre-wrap"> </span>IntConstraintOccurrence(constraintType

                                == ConstraintType.NEGATIVE_HARD, $weight
                                : weight)</div>
                              <div><span style="white-space:pre-wrap"> </span>sum($weight)</div>
                              <div><span style="white-space:pre-wrap"> </span>)</div>
                              <div><span style="white-space:pre-wrap"> </span>then</div>
                              <div><span style="white-space:pre-wrap"> </span>scoreHolder.setHardConstraintsBroken($hardTotal.intValue());</div>
                              <div>end</div>
                              <div><br>
                              </div>
                              <div><br>
                              </div>
                              <div>// Soft constraint</div>
                              <div><br>
                              </div>
                              <div>rule "computerCost"</div>
                              <div><span style="white-space:pre-wrap"> </span>when</div>
                              <div><span style="white-space:pre-wrap"> </span>$computer

                                : CloudComputer($cost : cost)</div>
                              <div><span style="white-space:pre-wrap"> </span>exists

                                CloudProcess(computer == $computer)</div>
                              <div><span style="white-space:pre-wrap"> </span>then</div>
                              <div><span style="white-space:pre-wrap"> </span>insertLogical(new

                                IntConstraintOccurrence("computerCost",
                                ConstraintType.NEGATIVE_SOFT,</div>
                              <div><span style="white-space:pre-wrap"> </span>$cost,</div>
                              <div><span style="white-space:pre-wrap"> </span>$computer));</div>
                              <div>end</div>
                              <div><br>
                              </div>
                              <div>rule "softConstraintBroken"</div>
                              <div><span style="white-space:pre-wrap"> </span>salience

                                -1</div>
                              <div><span style="white-space:pre-wrap"> </span>when</div>
                              <div><span style="white-space:pre-wrap"> </span>$softTotal

                                : Number() from accumulate(</div>
                              <div><span style="white-space:pre-wrap"> </span>IntConstraintOccurrence(ConstraintType

                                == ConstraintType.NEGATIVE_SOFT, $weight
                                : weight)</div>
                              <div><span style="white-space:pre-wrap"> </span>sum($weight)</div>
                              <div><span style="white-space:pre-wrap"> </span>)</div>
                              <div><span style="white-space:pre-wrap"> </span>then</div>
                              <div><span style="white-space:pre-wrap"> </span>scoreHolder.setHardConstraintsBroken($softTotal.intValue());</div>
                              <div>end</div>
                            </div>
                          </div>
                          <div>
                            <div>
                              <div class="gmail_extra"><br>
                                <br>
                                <div class="gmail_quote">2013/1/28
                                  Geoffrey De Smet <span dir="ltr">&lt;<a
                                      moz-do-not-send="true"
                                      href="mailto:ge0ffrey.spam@gmail.com"
                                      target="_blank">ge0ffrey.spam@gmail.com</a>&gt;</span><br>
                                  <blockquote class="gmail_quote"
                                    style="margin:0 0 0
                                    .8ex;border-left:1px #ccc
                                    solid;padding-left:1ex">
                                    <div bgcolor="#FFFFFF"
                                      text="#000000">
                                      com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.defaultConsequence(Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.java:14)


                                      <span style="white-space:pre-wrap"><br>
                                        What's in the then side of
                                        Rule_requiredCpuPowerTotal ?<br>
                                        <br>
                                      </span>
                                      <div>Op 28-01-13 16:00, Andr&eacute;
                                        Fr&oacute;es schreef:<br>
                                      </div>
                                      <div>
                                        <div>
                                          <blockquote type="cite">
                                            <div dir="ltr">Even adding
                                              that, the error still
                                              <div><br>
                                              </div>
                                              <div>--------------</div>
                                              <div>
                                                <div>12:57:41.050 [main]
                                                  INFO
                                                  &nbsp;o.d.p.core.solver.DefaultSolver
                                                  - Solving started:
                                                  time spend (152),
                                                  score (null), new best
                                                  score (null), random
                                                  seed (0).</div>
                                                <div>Exception in thread
                                                  "main" Exception
                                                  executing consequence
                                                  for rule
                                                  "requiredCpuPowerTotal"
                                                  in
                                                  com.swa.planner.domain.rule:
java.lang.NullPointerException</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.planner.core.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:177)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.planner.core.solver.scope.DefaultSolverScope.calculateScore(DefaultSolverScope.java:92)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.planner.core.phase.AbstractSolverPhaseScope.calculateScore(AbstractSolverPhaseScope.java:120)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.processMove(DefaultGreedyDecider.java:136)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.doMove(DefaultGreedyDecider.java:110)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.decideNextStep(DefaultGreedyDecider.java:82)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:65)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:155)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
com.swa.planner.domain.CloudTest.main(CloudTest.java:67)</div>
                                                <div>Caused by:
                                                  java.lang.NullPointerException</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
                                                  java.lang.String.&lt;init&gt;(Unknown
                                                  Source)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.mvel2.util.ErrorUtil.rewriteIfNeeded(ErrorUtil.java:12)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:302)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.mvel2.MVEL.compileExpression(MVEL.java:810)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.base.mvel.MVELCompilationUnit.compile(MVELCompilationUnit.java:435)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:206)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.SimpleBeliefSystem.insert(SimpleBeliefSystem.java:38)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:204)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:176)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:231)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:245)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:210)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:205)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.defaultConsequence(Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.java:14)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
                                                  com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987DefaultConsequenceInvokerGenerated.evaluate(Unknown


                                                  Source)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
                                                  com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987DefaultConsequenceInvoker.evaluate(Unknown


                                                  Source)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>... 14 more</div>
                                              </div>
                                              <div><br>
                                              </div>
                                              <div>--------------</div>
                                              <div><br>
                                              </div>
                                              <div>I added to
                                                cloudprocess computer
                                                variable:</div>
                                              <div>--------------</div>
                                              <div>
                                                <div>package
                                                  com.swa.planner.domain;</div>
                                                <div><br>
                                                </div>
                                                <div>import
                                                  org.drools.planner.api.domain.entity.PlanningEntity;</div>
                                                <div>import
                                                  org.drools.planner.api.domain.variable.PlanningVariable;</div>
                                                <div>import
                                                  org.drools.planner.api.domain.variable.ValueRange;</div>
                                                <div>import
                                                  org.drools.planner.api.domain.variable.ValueRangeType;</div>
                                                <div>import
                                                  org.drools.planner.examples.common.domain.AbstractPersistable;</div>
                                                <div><br>
                                                </div>
                                                <div>@PlanningEntity(difficultyComparatorClass

                                                  =
                                                  CloudProcessDifficultyComparator.class)</div>
                                                <div>public class
                                                  CloudProcess extends
                                                  AbstractPersistable{</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>private int
                                                  requiredCpuPower;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>private int
                                                  requiredMemory;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>private int
                                                  requiredNetworkBandwidth;</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>private
                                                  CloudComputer
                                                  computer;</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public
                                                  CloudProcess(long id,
                                                  int requiredCpuPower,
                                                  int requiredMemory,</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>int
                                                  requiredNetworkBandwidth)
                                                  {</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>super();</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>setId(id);</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>this.requiredCpuPower


                                                  = requiredCpuPower;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>this.requiredMemory


                                                  = requiredMemory;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>this.requiredNetworkBandwidth


                                                  =
                                                  requiredNetworkBandwidth;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>}</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span></div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public
                                                  CloudProcess() {<span
style="white-space:pre-wrap"> </span>}</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public int
                                                  getRequiredCpuPower()
                                                  {</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>return
                                                  requiredCpuPower;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>}</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public void
                                                  setRequiredCpuPower(int
                                                  requiredCpuPower) {</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>this.requiredCpuPower


                                                  = requiredCpuPower;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>}</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public int
                                                  getRequiredMemory() {</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>return
                                                  requiredMemory;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>}</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public void
                                                  setRequiredMemory(int
                                                  requiredMemory) {</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>this.requiredMemory


                                                  = requiredMemory;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>}</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public int
                                                  getRequiredNetworkBandwidth()
                                                  {</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>return
                                                  requiredNetworkBandwidth;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>}</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public void
                                                  setRequiredNetworkBandwidth(int
                                                  requiredNetworkBandwidth)
                                                  {</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>this.requiredNetworkBandwidth


                                                  =
                                                  requiredNetworkBandwidth;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>}</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public String
                                                  getLabel() {</div>
                                                <div>&nbsp; &nbsp; &nbsp; &nbsp; return
                                                  "Process " + id;</div>
                                                <div>&nbsp; &nbsp; }</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span></div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>@PlanningVariable(strengthComparatorClass


                                                  =
                                                  CloudComputerStrengthComparator.class)</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>@ValueRange(type


                                                  =
                                                  ValueRangeType.FROM_SOLUTION_PROPERTY,
                                                  solutionProperty =
                                                  "computerList")</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public
                                                  CloudComputer
                                                  getComputer() {</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>if (computer ==
                                                  null) { return null; }</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>return
                                                  computer;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>}</div>
                                                <div><br>
                                                </div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public void
                                                  setComputer(CloudComputer
                                                  computer) {</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>this.computer =
                                                  computer;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>}</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span></div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public
                                                  CloudProcess clone(){</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>CloudProcess
                                                  clone = new
                                                  CloudProcess();</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span><a
                                                    moz-do-not-send="true"
href="http://clone.id" target="_blank">clone.id</a> = id;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>clone.requiredCpuPower


                                                  = requiredCpuPower;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>clone.requiredMemory


                                                  = requiredMemory;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>clone.requiredNetworkBandwidth


                                                  =
                                                  requiredNetworkBandwidth;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>clone.computer
                                                  = computer;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>return clone;</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>}</div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span></div>
                                                <div><span
                                                    style="white-space:pre-wrap">
                                                  </span>public int
                                                  getRequiredMultiplicand()
                                                  {</div>
                                                <div>&nbsp; &nbsp; &nbsp; &nbsp; return
                                                  requiredCpuPower *
                                                  requiredMemory *
                                                  requiredNetworkBandwidth;</div>
                                                <div>&nbsp; &nbsp; }</div>
                                                <div>}</div>
                                                <div>--------------<br>
                                                </div>
                                                <div><br>
                                                </div>
                                                <div>this is what i'm
                                                  doing to run the
                                                  example:</div>
                                                <div><br>
                                                </div>
                                                <div>-------------</div>
                                                <div>
                                                  <div>package
                                                    com.swa.planner.domain;</div>
                                                  <div><br>
                                                  </div>
                                                  <div>import
                                                    java.io.ByteArrayInputStream;</div>
                                                  <div>import
                                                    java.util.ArrayList;</div>
                                                  <div>import
                                                    java.util.List;</div>
                                                  <div><br>
                                                  </div>
                                                  <div>import
                                                    org.drools.planner.config.SolverFactory;</div>
                                                  <div>import
                                                    org.drools.planner.config.XmlSolverFactory;</div>
                                                  <div>import
                                                    org.drools.planner.core.Solver;</div>
                                                  <div><br>
                                                  </div>
                                                  <div>public class
                                                    CloudTest {</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>public static
                                                    void main(String[]
                                                    args) {</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>String t =
                                                    "&lt;?xml
                                                    version=\"1.0\"
                                                    encoding=\"UTF-8\"?&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+
                                                    "&lt;solver&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ "
&nbsp;&lt;solutionClass&gt;com.swa.planner.domain.CloudBalance&lt;/solutionClass&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ "
&nbsp;&lt;planningEntityClass&gt;com.swa.planner.domain.CloudProcess&lt;/planningEntityClass&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ "
                                                    &nbsp;&lt;scoreDirectorFactory&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp;
                                                    &nbsp;&lt;scoreDefinitionType&gt;HARD_AND_SOFT&lt;/scoreDefinitionType&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp;
&nbsp;&lt;scoreDrl&gt;/com/swa/planner/domain/rule/cloudBalancingScoreRules.drl&lt;/scoreDrl&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ "
                                                    &nbsp;&lt;/scoreDirectorFactory&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ "
                                                    &nbsp;&lt;termination&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp;
                                                    &nbsp;&lt;maximumSecondsSpend&gt;120&lt;/maximumSecondsSpend&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ "
                                                    &nbsp;&lt;/termination&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ "
                                                    &nbsp;&lt;constructionHeuristic&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp;
&nbsp;&lt;constructionHeuristicType&gt;FIRST_FIT_DECREASING&lt;/constructionHeuristicType&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp;
&nbsp;&lt;constructionHeuristicPickEarlyType&gt;FIRST_LAST_STEP_SCORE_EQUAL_OR_IMPROVING&lt;/constructionHeuristicPickEarlyType&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ "
                                                    &nbsp;&lt;/constructionHeuristic&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ "
                                                    &nbsp;&lt;localSearch&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp;
                                                    &nbsp;&lt;acceptor&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp; &nbsp;
&nbsp;&lt;planningEntityTabuSize&gt;7&lt;/planningEntityTabuSize&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp;
                                                    &nbsp;&lt;/acceptor&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp;
                                                    &nbsp;&lt;forager&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp; &nbsp;
&nbsp;&lt;minimalAcceptedSelection&gt;1000&lt;/minimalAcceptedSelection&gt;"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ " &nbsp;
                                                    &nbsp;&lt;/forager&gt;"&nbsp;</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+ "
                                                    &nbsp;&lt;/localSearch&gt;"&nbsp;</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+
                                                    "&lt;/solver&gt;";</div>
                                                  <div><br>
                                                  </div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>byte b[] =
                                                    t.getBytes();</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>ByteArrayInputStream


                                                    bt = new
                                                    ByteArrayInputStream(b);</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>SolverFactory
                                                    solverFactory = new
XmlSolverFactory().configure(bt);</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>Solver solver
                                                    =
                                                    solverFactory.buildSolver();</div>
                                                  <div><br>
                                                  </div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>List&lt;CloudComputer&gt;


                                                    computerList = new
                                                    ArrayList&lt;CloudComputer&gt;();</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>computerList.add(new


                                                    CloudComputer(1L,
                                                    "Computador 1", 3,
                                                    2, 2, 110));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>computerList.add(new


                                                    CloudComputer(2L,
                                                    "Computador 2", 12,
                                                    8, 3, 400));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>computerList.add(new


                                                    CloudComputer(3L,
                                                    "Computador 3", 6,
                                                    6, 4, 300));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>computerList.add(new


                                                    CloudComputer(4L,
                                                    "Computador 4", 18,
                                                    12, 8, 1000));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>computerList.add(new


                                                    CloudComputer(5L,
                                                    "Computador 5", 8,
                                                    4, 6, 800));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>computerList.add(new


                                                    CloudComputer(6L,
                                                    "Computador 6", 9,
                                                    7, 9, 1000));</div>
                                                  <div><br>
                                                  </div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>List&lt;CloudProcess&gt;


                                                    processList = new
                                                    ArrayList&lt;CloudProcess&gt;();</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>processList.add(new


                                                    CloudProcess(11L, 2,
                                                    2, 2));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>processList.add(new


                                                    CloudProcess(12L, 4,
                                                    4, 2));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>processList.add(new


                                                    CloudProcess(13L, 1,
                                                    1, 3));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>processList.add(new


                                                    CloudProcess(14L, 7,
                                                    3, 5));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>processList.add(new


                                                    CloudProcess(15L, 5,
                                                    8, 3));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>processList.add(new


                                                    CloudProcess(16L, 9,
                                                    2, 2));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>processList.add(new


                                                    CloudProcess(17L, 6,
                                                    5, 6));</div>
                                                  <div><br>
                                                  </div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>CloudBalance
                                                    cloudBalance = new
                                                    CloudBalance();</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>cloudBalance.setId(0L);</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>cloudBalance.setComputerList(computerList);</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>cloudBalance.setProcessList(processList);</div>
                                                  <div><br>
                                                  </div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>// Solve the
                                                    problem</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>solver.setPlanningProblem(cloudBalance);</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>solver.solve();</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>CloudBalance
                                                    solvedCloudBalance =
                                                    (CloudBalance)
                                                    solver.getBestSolution();</div>
                                                  <div><br>
                                                  </div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>// Display
                                                    the result</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>System.out.println("\nSolved


                                                    cloudBalance with 5
                                                    computers and 6
                                                    processes:\n"</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>+
toDisplayString(solvedCloudBalance));</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>}</div>
                                                  <div><br>
                                                  </div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>public static
                                                    String
                                                    toDisplayString(CloudBalance
                                                    cloudBalance) {</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>StringBuilder
                                                    displayString = new
                                                    StringBuilder();</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>for
                                                    (CloudProcess
                                                    process :
                                                    cloudBalance.getProcessList())
                                                    {</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>CloudComputer
                                                    computer =
                                                    process.getComputer();</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>displayString.append("


&nbsp;").append(process.getLabel())</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>.append("
                                                    -&gt; ")</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>.append(computer


                                                    == null ? null :
                                                    computer.getLabel())</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>.append("\n");</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>}</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>return
                                                    displayString.toString();</div>
                                                  <div><span
                                                      style="white-space:pre-wrap">
                                                    </span>}</div>
                                                  <div>}</div>
                                                  <div><br>
                                                  </div>
                                                </div>
                                                <div>-------------</div>
                                              </div>
                                            </div>
                                            <div class="gmail_extra"><br>
                                              <br>
                                              <div class="gmail_quote">2013/1/28

                                                Geoffrey De Smet <span
                                                  dir="ltr">&lt;<a
                                                    moz-do-not-send="true"
href="mailto:ge0ffrey.spam@gmail.com" target="_blank">ge0ffrey.spam@gmail.com</a>&gt;</span><br>
                                                <blockquote
                                                  class="gmail_quote"
                                                  style="margin:0 0 0
                                                  .8ex;border-left:1px
                                                  #ccc
                                                  solid;padding-left:1ex">
                                                  <div bgcolor="#FFFFFF"
                                                    text="#000000"> The
                                                    value of a variable
                                                    of an entity starts
                                                    out as null during
                                                    construction
                                                    heuristics, even if
                                                    it's not nullable.<br>
                                                    <br>
                                                    The usual trick is
                                                    to add null safe
                                                    getters:<br>
                                                    <br>
                                                    public class
                                                    BedDesignation {<br>
                                                    <br>
                                                    &nbsp;&nbsp; // bed is
                                                    planning variable<br>
                                                    &nbsp; ...<br>
                                                    &nbsp; public Departement
                                                    getDepartment() {<br>
                                                    &nbsp;&nbsp;&nbsp;&nbsp; if (bed ==
                                                    null) { return
                                                    null;}<br>
                                                    &nbsp;&nbsp;&nbsp;&nbsp; return
                                                    bed.getRoom().getDepartement()<br>
                                                    &nbsp; }<br>
                                                    }<br>
                                                    <br>
                                                    <br>
                                                    <div>Op 28-01-13
                                                      15:13, Andr&eacute; Fr&oacute;es
                                                      schreef:<br>
                                                    </div>
                                                    <blockquote
                                                      type="cite">
                                                      <div dir="ltr">I've
                                                        implemented it
                                                        to see how it
                                                        would work, now
                                                        I got another
                                                        error:
                                                        <div><br>
                                                        </div>
                                                        <div>---------------</div>
                                                        <div><br>
                                                        </div>
                                                        <div>
                                                          <div>12:10:41.357
                                                          [main] INFO
                                                          &nbsp;o.d.p.core.solver.DefaultSolver
                                                          - Solving
                                                          started: time
                                                          spend (302),
                                                          score (null),
                                                          new best score
                                                          (null), random
                                                          seed (0).</div>
                                                          <div>Exception
                                                          in thread
                                                          "main"
                                                          Exception
                                                          executing
                                                          consequence
                                                          for rule
                                                          "requiredCpuPowerTotal"
                                                          in
                                                          com.swa.planner.domain.rule:
java.lang.NullPointerException</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:177)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.solver.scope.DefaultSolverScope.calculateScore(DefaultSolverScope.java:92)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.phase.AbstractSolverPhaseScope.calculateScore(AbstractSolverPhaseScope.java:120)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.processMove(DefaultGreedyDecider.java:136)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.doMove(DefaultGreedyDecider.java:110)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.decideNextStep(DefaultGreedyDecider.java:82)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:65)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:155)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
com.swa.planner.domain.CloudTest.main(CloudTest.java:65)</div>
                                                          <div>Caused
                                                          by:
                                                          java.lang.NullPointerException</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
                                                          java.lang.String.&lt;init&gt;(Unknown
                                                          Source)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.mvel2.util.ErrorUtil.rewriteIfNeeded(ErrorUtil.java:12)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:302)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
                                                          org.mvel2.MVEL.compileExpression(MVEL.java:810)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.base.mvel.MVELCompilationUnit.compile(MVELCompilationUnit.java:435)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:206)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.SimpleBeliefSystem.insert(SimpleBeliefSystem.java:38)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:204)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:176)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:231)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:245)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:210)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:205)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bd.defaultConsequence(Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bd.java:14)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
                                                          com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bdDefaultConsequenceInvokerGenerated.evaluate(Unknown



                                                          Source)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
                                                          com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bdDefaultConsequenceInvoker.evaluate(Unknown



                                                          Source)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>... 14
                                                          more</div>
                                                        </div>
                                                        <div><br>
                                                        </div>
                                                        <div>-----------------</div>
                                                        <div><br>
                                                        </div>
                                                        <div>this one i
                                                          have no clue&nbsp;</div>
                                                      </div>
                                                      <div
                                                        class="gmail_extra"><br>
                                                        <br>
                                                        <div
                                                          class="gmail_quote">2013/1/28

                                                          Andr&eacute; Fr&oacute;es <span
                                                          dir="ltr">&lt;<a
moz-do-not-send="true" href="mailto:arfmoraes@gmail.com" target="_blank">arfmoraes@gmail.com</a>&gt;</span><br>
                                                          <blockquote
                                                          class="gmail_quote"
                                                          style="margin:0
                                                          0 0
                                                          .8ex;border-left:1px
                                                          #ccc
                                                          solid;padding-left:1ex">
                                                          <div dir="ltr">
                                                          <div>Hello
                                                          there, i'm
                                                          getting this
                                                          error:</div>
                                                          <div><br>
                                                          </div>
                                                          <div>-------------------</div>
                                                          <div>
                                                          <div>
                                                          11:26:50.394
                                                          [main] INFO
                                                          &nbsp;o.d.p.core.solver.DefaultSolver
                                                          - Solving
                                                          started: time
                                                          spend (187),
                                                          score (null),
                                                          new best score
                                                          (null), random
                                                          seed (0).</div>
                                                          <div>Exception
                                                          in thread
                                                          "main"
                                                          java.lang.IllegalStateException:
                                                          The
                                                          selectionOrder
                                                          (DECREASING_DIFFICULTY)

                                                          can not be
                                                          used on a
                                                          PlanningEntity
                                                          (com.swa.planner.domain.CloudProcess)

                                                          that has no
                                                          support for
                                                          difficulty
                                                          sorting. Check
                                                          the
                                                          @PlanningEntity
                                                          annotation.</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.heuristic.selector.entity.PlanningEntitySelector.validate(PlanningEntitySelector.java:53)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.heuristic.selector.entity.PlanningEntitySelector.phaseStarted(PlanningEntitySelector.java:45)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.constructionheuristic.greedyFit.selector.GreedyPlanningEntitySelector.phaseStarted(GreedyPlanningEntitySelector.java:41)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.phaseStarted(DefaultGreedyFitSolverPhase.java:111)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:57)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:155)</div>
                                                          <div><span
                                                          style="white-space:pre-wrap">
                                                          </span>at
com.swa.planner.domain.CloudTest.main(CloudTest.java:51)</div>
                                                          <div>-------------------------</div>
                                                          <div><br>
                                                          </div>
                                                          <div>I know
                                                          why it is
                                                          happening
                                                          though (at
                                                          least i think
                                                          so), but will
                                                          I have to
                                                          implement the
                                                          comparator to
                                                          every planner
                                                          I do or is
                                                          there any
                                                          other way to
                                                          make it work?</div>
                                                          <div><br>
                                                          </div>
                                                          <div>I'm
                                                          reproducing
                                                          the example
                                                          from the
                                                          guide, when it
                                                          passes the
                                                          drools rules
                                                          it gives that
                                                          message. I
                                                          didn't
                                                          implement
                                                          CloudComputerStrengthComparator
                                                          neither&nbsp;CloudProcessDifficultyComparator,


                                                          will I have to
                                                          implement
                                                          those so this
                                                          example works?</div>
                                                          </div>
                                                          </div>
                                                          </blockquote>
                                                        </div>
                                                        <br>
                                                      </div>
                                                      <br>
                                                      <fieldset></fieldset>
                                                      <br>
                                                      <pre>_______________________________________________
rules-users mailing list
<a moz-do-not-send="true" href="mailto:rules-users@lists.jboss.org" target="_blank">rules-users@lists.jboss.org</a>
<a moz-do-not-send="true" href="https://lists.jboss.org/mailman/listinfo/rules-users" target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a>
</pre>
                                                    </blockquote>
                                                    <br>
                                                  </div>
                                                  <br>
_______________________________________________<br>
                                                  rules-users mailing
                                                  list<br>
                                                  <a
                                                    moz-do-not-send="true"
href="mailto:rules-users@lists.jboss.org" target="_blank">rules-users@lists.jboss.org</a><br>
                                                  <a
                                                    moz-do-not-send="true"
href="https://lists.jboss.org/mailman/listinfo/rules-users"
                                                    target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a><br>
                                                  <br>
                                                </blockquote>
                                              </div>
                                              <br>
                                            </div>
                                            <br>
                                            <fieldset></fieldset>
                                            <br>
                                            <pre>_______________________________________________
rules-users mailing list
<a moz-do-not-send="true" href="mailto:rules-users@lists.jboss.org" target="_blank">rules-users@lists.jboss.org</a>
<a moz-do-not-send="true" href="https://lists.jboss.org/mailman/listinfo/rules-users" target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a>
</pre>
                                          </blockquote>
                                          <br>
                                        </div>
                                      </div>
                                    </div>
                                    <br>
_______________________________________________<br>
                                    rules-users mailing list<br>
                                    <a moz-do-not-send="true"
                                      href="mailto:rules-users@lists.jboss.org"
                                      target="_blank">rules-users@lists.jboss.org</a><br>
                                    <a moz-do-not-send="true"
                                      href="https://lists.jboss.org/mailman/listinfo/rules-users"
                                      target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a><br>
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                    <pre>_______________________________________________
rules-users mailing list
<a moz-do-not-send="true" href="mailto:rules-users@lists.jboss.org" target="_blank">rules-users@lists.jboss.org</a>
<a moz-do-not-send="true" href="https://lists.jboss.org/mailman/listinfo/rules-users" target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a>
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            _______________________________________________<br>
            rules-users mailing list<br>
            <a moz-do-not-send="true"
              href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a><br>
            <a moz-do-not-send="true"
              href="https://lists.jboss.org/mailman/listinfo/rules-users"
              target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a><br>
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      <pre wrap="">_______________________________________________
rules-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a>
<a class="moz-txt-link-freetext" href="https://lists.jboss.org/mailman/listinfo/rules-users">https://lists.jboss.org/mailman/listinfo/rules-users</a>
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