[rules-users] Error selecting order decrease [planner] - mvel NPE eats real exception?
André Fróes
arfmoraes at gmail.com
Mon Jan 28 11:08:29 EST 2013
I'm sending a screenshot of my libs, all from the bundle downloaded from
site. Also sending the full proj if u want to analyze.
[image: Imagem inline 1]
2013/1/28 Geoffrey De Smet <ge0ffrey.spam at gmail.com>
> Which mvel2 jar version?
>
> Provided that the mvel version is correct, it looks like the real
> exception gets eaten...
>
> Caused by: java.lang.NullPointerException
> at java.lang.String.<init>(Unknown Source)
> at org.mvel2.util.ErrorUtil.rewriteIfNeeded(ErrorUtil.java:12)
>
> If that's true, we need to open a jira. Pinging Mario on this.
>
> In any case, the exception message should be much clearer as to what's the
> problem is.
>
> Op 28-01-13 16:51, André Fróes schreef:
>
> 5.5.0.Final both
>
>
> 2013/1/28 Geoffrey De Smet <ge0ffrey.spam at gmail.com>
>
>> Which version of planner (drools-planner-core) and drools (drools-core,
>> drools-compiler)?
>> Op 28-01-13 16:40, André Fróes schreef:
>>
>> 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.
>>
>>
>> 2013/1/28 André Fróes <arfmoraes at gmail.com>
>>
>>> this is the full drl file:
>>>
>>> ------------
>>>
>>> package com.swa.planner.domain.rule;
>>>
>>> import
>>> org.drools.planner.core.score.buildin.hardandsoft.HardAndSoftScoreHolder;
>>> import org.drools.planner.core.score.constraint.IntConstraintOccurrence;
>>> import org.drools.planner.core.score.constraint.ConstraintType;
>>>
>>> import com.swa.planner.domain.CloudBalance;
>>> import com.swa.planner.domain.CloudComputer;
>>> import com.swa.planner.domain.CloudProcess;
>>>
>>> global HardAndSoftScoreHolder scoreHolder;
>>>
>>> rule "requiredCpuPowerTotal"
>>> when
>>> $computer : CloudComputer($cpuPower : cpuPower)
>>> $requiredCpuPowerTotal : Number(intValue > $cpuPower) from accumulate(
>>> CloudProcess (
>>> computer == $computer,
>>> $requiredCpuPower : requiredCpuPower),
>>> sum($requiredCpuPower)
>>> )
>>> then
>>> insertLogical(new IntConstraintOccurrence("requiredCpuPowerTotal",
>>> ConstraintType.NEGATIVE_HARD,
>>> $requiredCpuPowerTotal.intValue() - $cpuPower,
>>> $computer));
>>> end
>>>
>>> rule "requiredMemoryTotal"
>>> when
>>> $computer : CloudComputer($memory : memory)
>>> $requiredMemoryTotal : Number(intValue > $memory) from accumulate(
>>> CloudProcess (
>>> computer == $computer,
>>> $requiredMemory : requiredMemory),
>>> sum($requiredMemory)
>>> )
>>> then
>>> insertLogical(new IntConstraintOccurrence("requiredMemoryTotal",
>>> ConstraintType.NEGATIVE_HARD,
>>> $requiredMemoryTotal.intValue() - $memory,
>>> $computer));
>>> end
>>>
>>> rule "requiredNetworkBandwidth"
>>> when
>>> $computer : CloudComputer($networkBandwidth : networkBandwidth)
>>> $requiredNetworkBandwidthTotal : Number(intValue > $networkBandwidth)
>>> from accumulate(
>>> CloudProcess (
>>> computer == $computer,
>>> $requiredNetworkBandwidth : requiredNetworkBandwidth)
>>> sum($requiredNetworkBandwidth)
>>> )
>>> then
>>> insertLogical(new IntConstraintOccurrence("requiredNetworkBandwidth",
>>> ConstraintType.NEGATIVE_HARD,
>>> $requiredNetworkBandwidthTotal.intValue() - $networkBandwidth,
>>> $computer));
>>> end
>>>
>>> rule "hardConstraintBroken"
>>> salience -1
>>> when
>>> $hardTotal : Number() from accumulate(
>>> IntConstraintOccurrence(constraintType ==
>>> ConstraintType.NEGATIVE_HARD, $weight : weight)
>>> sum($weight)
>>> )
>>> then
>>> scoreHolder.setHardConstraintsBroken($hardTotal.intValue());
>>> end
>>>
>>>
>>> // Soft constraint
>>>
>>> rule "computerCost"
>>> when
>>> $computer : CloudComputer($cost : cost)
>>> exists CloudProcess(computer == $computer)
>>> then
>>> insertLogical(new IntConstraintOccurrence("computerCost",
>>> ConstraintType.NEGATIVE_SOFT,
>>> $cost,
>>> $computer));
>>> end
>>>
>>> rule "softConstraintBroken"
>>> salience -1
>>> when
>>> $softTotal : Number() from accumulate(
>>> IntConstraintOccurrence(ConstraintType ==
>>> ConstraintType.NEGATIVE_SOFT, $weight : weight)
>>> sum($weight)
>>> )
>>> then
>>> scoreHolder.setHardConstraintsBroken($softTotal.intValue());
>>> end
>>>
>>>
>>> 2013/1/28 Geoffrey De Smet <ge0ffrey.spam at gmail.com>
>>>
>>>> com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.defaultConsequence(Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.java:14)
>>>>
>>>> What's in the then side of Rule_requiredCpuPowerTotal ?
>>>>
>>>> Op 28-01-13 16:00, André Fróes schreef:
>>>>
>>>> Even adding that, the error still
>>>>
>>>> --------------
>>>> 12:57:41.050 [main] INFO o.d.p.core.solver.DefaultSolver - Solving
>>>> started: time spend (152), score (null), new best score (null), random seed
>>>> (0).
>>>> Exception in thread "main" Exception executing consequence for rule
>>>> "requiredCpuPowerTotal" in com.swa.planner.domain.rule:
>>>> java.lang.NullPointerException
>>>> at
>>>> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
>>>> at
>>>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)
>>>> at
>>>> org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)
>>>> at
>>>> org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)
>>>> at
>>>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
>>>> at
>>>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
>>>> at
>>>> org.drools.planner.core.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:177)
>>>> at
>>>> org.drools.planner.core.solver.scope.DefaultSolverScope.calculateScore(DefaultSolverScope.java:92)
>>>> at
>>>> org.drools.planner.core.phase.AbstractSolverPhaseScope.calculateScore(AbstractSolverPhaseScope.java:120)
>>>> at
>>>> org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.processMove(DefaultGreedyDecider.java:136)
>>>> at
>>>> org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.doMove(DefaultGreedyDecider.java:110)
>>>> at
>>>> org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.decideNextStep(DefaultGreedyDecider.java:82)
>>>> at
>>>> org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:65)
>>>> at
>>>> org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)
>>>> at
>>>> org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:155)
>>>> at com.swa.planner.domain.CloudTest.main(CloudTest.java:67)
>>>> Caused by: java.lang.NullPointerException
>>>> at java.lang.String.<init>(Unknown Source)
>>>> at org.mvel2.util.ErrorUtil.rewriteIfNeeded(ErrorUtil.java:12)
>>>> at
>>>> org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:302)
>>>> at
>>>> org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)
>>>> at org.mvel2.MVEL.compileExpression(MVEL.java:810)
>>>> at
>>>> org.drools.base.mvel.MVELCompilationUnit.compile(MVELCompilationUnit.java:435)
>>>> at
>>>> org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238)
>>>> at
>>>> org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:206)
>>>> at
>>>> org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190)
>>>> at
>>>> org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157)
>>>> at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)
>>>> at
>>>> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
>>>> at
>>>> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
>>>> at
>>>> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
>>>> at
>>>> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
>>>> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
>>>> at
>>>> org.drools.common.SimpleBeliefSystem.insert(SimpleBeliefSystem.java:38)
>>>> at
>>>> org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:204)
>>>> at
>>>> org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:176)
>>>> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:231)
>>>> at
>>>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
>>>> at
>>>> org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:245)
>>>> at
>>>> org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:210)
>>>> at
>>>> org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:205)
>>>> at
>>>> com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.defaultConsequence(Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.java:14)
>>>> at
>>>> com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987DefaultConsequenceInvokerGenerated.evaluate(Unknown
>>>> Source)
>>>> at
>>>> com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987DefaultConsequenceInvoker.evaluate(Unknown
>>>> Source)
>>>> at
>>>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
>>>> ... 14 more
>>>>
>>>> --------------
>>>>
>>>> I added to cloudprocess computer variable:
>>>> --------------
>>>> package com.swa.planner.domain;
>>>>
>>>> import org.drools.planner.api.domain.entity.PlanningEntity;
>>>> import org.drools.planner.api.domain.variable.PlanningVariable;
>>>> import org.drools.planner.api.domain.variable.ValueRange;
>>>> import org.drools.planner.api.domain.variable.ValueRangeType;
>>>> import org.drools.planner.examples.common.domain.AbstractPersistable;
>>>>
>>>> @PlanningEntity(difficultyComparatorClass =
>>>> CloudProcessDifficultyComparator.class)
>>>> public class CloudProcess extends AbstractPersistable{
>>>>
>>>> private int requiredCpuPower;
>>>> private int requiredMemory;
>>>> private int requiredNetworkBandwidth;
>>>>
>>>> private CloudComputer computer;
>>>>
>>>> public CloudProcess(long id, int requiredCpuPower, int requiredMemory,
>>>> int requiredNetworkBandwidth) {
>>>> super();
>>>> setId(id);
>>>> this.requiredCpuPower = requiredCpuPower;
>>>> this.requiredMemory = requiredMemory;
>>>> this.requiredNetworkBandwidth = requiredNetworkBandwidth;
>>>> }
>>>> public CloudProcess() { }
>>>>
>>>> public int getRequiredCpuPower() {
>>>> return requiredCpuPower;
>>>> }
>>>>
>>>> public void setRequiredCpuPower(int requiredCpuPower) {
>>>> this.requiredCpuPower = requiredCpuPower;
>>>> }
>>>>
>>>> public int getRequiredMemory() {
>>>> return requiredMemory;
>>>> }
>>>>
>>>> public void setRequiredMemory(int requiredMemory) {
>>>> this.requiredMemory = requiredMemory;
>>>> }
>>>>
>>>> public int getRequiredNetworkBandwidth() {
>>>> return requiredNetworkBandwidth;
>>>> }
>>>>
>>>> public void setRequiredNetworkBandwidth(int requiredNetworkBandwidth)
>>>> {
>>>> this.requiredNetworkBandwidth = requiredNetworkBandwidth;
>>>> }
>>>>
>>>> public String getLabel() {
>>>> return "Process " + id;
>>>> }
>>>> @PlanningVariable(strengthComparatorClass =
>>>> CloudComputerStrengthComparator.class)
>>>> @ValueRange(type = ValueRangeType.FROM_SOLUTION_PROPERTY,
>>>> solutionProperty = "computerList")
>>>> public CloudComputer getComputer() {
>>>> if (computer == null) { return null; }
>>>> return computer;
>>>> }
>>>>
>>>> public void setComputer(CloudComputer computer) {
>>>> this.computer = computer;
>>>> }
>>>> public CloudProcess clone(){
>>>> CloudProcess clone = new CloudProcess();
>>>> clone.id = id;
>>>> clone.requiredCpuPower = requiredCpuPower;
>>>> clone.requiredMemory = requiredMemory;
>>>> clone.requiredNetworkBandwidth = requiredNetworkBandwidth;
>>>> clone.computer = computer;
>>>> return clone;
>>>> }
>>>> public int getRequiredMultiplicand() {
>>>> return requiredCpuPower * requiredMemory *
>>>> requiredNetworkBandwidth;
>>>> }
>>>> }
>>>> --------------
>>>>
>>>> this is what i'm doing to run the example:
>>>>
>>>> -------------
>>>> package com.swa.planner.domain;
>>>>
>>>> import java.io.ByteArrayInputStream;
>>>> import java.util.ArrayList;
>>>> import java.util.List;
>>>>
>>>> import org.drools.planner.config.SolverFactory;
>>>> import org.drools.planner.config.XmlSolverFactory;
>>>> import org.drools.planner.core.Solver;
>>>>
>>>> public class CloudTest {
>>>> public static void main(String[] args) {
>>>> String t = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
>>>> + "<solver>"
>>>> + "
>>>> <solutionClass>com.swa.planner.domain.CloudBalance</solutionClass>"
>>>> + "
>>>> <planningEntityClass>com.swa.planner.domain.CloudProcess</planningEntityClass>"
>>>> + " <scoreDirectorFactory>"
>>>> + " <scoreDefinitionType>HARD_AND_SOFT</scoreDefinitionType>"
>>>> + "
>>>> <scoreDrl>/com/swa/planner/domain/rule/cloudBalancingScoreRules.drl</scoreDrl>"
>>>> + " </scoreDirectorFactory>"
>>>> + " <termination>"
>>>> + " <maximumSecondsSpend>120</maximumSecondsSpend>"
>>>> + " </termination>"
>>>> + " <constructionHeuristic>"
>>>> + "
>>>> <constructionHeuristicType>FIRST_FIT_DECREASING</constructionHeuristicType>"
>>>> + "
>>>> <constructionHeuristicPickEarlyType>FIRST_LAST_STEP_SCORE_EQUAL_OR_IMPROVING</constructionHeuristicPickEarlyType>"
>>>> + " </constructionHeuristic>"
>>>> + " <localSearch>"
>>>> + " <acceptor>"
>>>> + " <planningEntityTabuSize>7</planningEntityTabuSize>"
>>>> + " </acceptor>"
>>>> + " <forager>"
>>>> + " <minimalAcceptedSelection>1000</minimalAcceptedSelection>"
>>>> + " </forager>"
>>>> + " </localSearch>"
>>>> + "</solver>";
>>>>
>>>> byte b[] = t.getBytes();
>>>> ByteArrayInputStream bt = new ByteArrayInputStream(b);
>>>> SolverFactory solverFactory = new XmlSolverFactory().configure(bt);
>>>> Solver solver = solverFactory.buildSolver();
>>>>
>>>> List<CloudComputer> computerList = new ArrayList<CloudComputer>();
>>>> computerList.add(new CloudComputer(1L, "Computador 1", 3, 2, 2, 110));
>>>> computerList.add(new CloudComputer(2L, "Computador 2", 12, 8, 3,
>>>> 400));
>>>> computerList.add(new CloudComputer(3L, "Computador 3", 6, 6, 4, 300));
>>>> computerList.add(new CloudComputer(4L, "Computador 4", 18, 12, 8,
>>>> 1000));
>>>> computerList.add(new CloudComputer(5L, "Computador 5", 8, 4, 6, 800));
>>>> computerList.add(new CloudComputer(6L, "Computador 6", 9, 7, 9,
>>>> 1000));
>>>>
>>>> List<CloudProcess> processList = new ArrayList<CloudProcess>();
>>>> processList.add(new CloudProcess(11L, 2, 2, 2));
>>>> processList.add(new CloudProcess(12L, 4, 4, 2));
>>>> processList.add(new CloudProcess(13L, 1, 1, 3));
>>>> processList.add(new CloudProcess(14L, 7, 3, 5));
>>>> processList.add(new CloudProcess(15L, 5, 8, 3));
>>>> processList.add(new CloudProcess(16L, 9, 2, 2));
>>>> processList.add(new CloudProcess(17L, 6, 5, 6));
>>>>
>>>> CloudBalance cloudBalance = new CloudBalance();
>>>> cloudBalance.setId(0L);
>>>> cloudBalance.setComputerList(computerList);
>>>> cloudBalance.setProcessList(processList);
>>>>
>>>> // Solve the problem
>>>> solver.setPlanningProblem(cloudBalance);
>>>> solver.solve();
>>>> CloudBalance solvedCloudBalance = (CloudBalance)
>>>> solver.getBestSolution();
>>>>
>>>> // Display the result
>>>> System.out.println("\nSolved cloudBalance with 5 computers and 6
>>>> processes:\n"
>>>> + toDisplayString(solvedCloudBalance));
>>>> }
>>>>
>>>> public static String toDisplayString(CloudBalance cloudBalance) {
>>>> StringBuilder displayString = new StringBuilder();
>>>> for (CloudProcess process : cloudBalance.getProcessList()) {
>>>> CloudComputer computer = process.getComputer();
>>>> displayString.append(" ").append(process.getLabel())
>>>> .append(" -> ")
>>>> .append(computer == null ? null : computer.getLabel())
>>>> .append("\n");
>>>> }
>>>> return displayString.toString();
>>>> }
>>>> }
>>>>
>>>> -------------
>>>>
>>>>
>>>> 2013/1/28 Geoffrey De Smet <ge0ffrey.spam at gmail.com>
>>>>
>>>>> The value of a variable of an entity starts out as null during
>>>>> construction heuristics, even if it's not nullable.
>>>>>
>>>>> The usual trick is to add null safe getters:
>>>>>
>>>>> public class BedDesignation {
>>>>>
>>>>> // bed is planning variable
>>>>> ...
>>>>> public Departement getDepartment() {
>>>>> if (bed == null) { return null;}
>>>>> return bed.getRoom().getDepartement()
>>>>> }
>>>>> }
>>>>>
>>>>>
>>>>> Op 28-01-13 15:13, André Fróes schreef:
>>>>>
>>>>> I've implemented it to see how it would work, now I got another error:
>>>>>
>>>>> ---------------
>>>>>
>>>>> 12:10:41.357 [main] INFO o.d.p.core.solver.DefaultSolver - Solving
>>>>> started: time spend (302), score (null), new best score (null), random seed
>>>>> (0).
>>>>> Exception in thread "main" Exception executing consequence for rule
>>>>> "requiredCpuPowerTotal" in com.swa.planner.domain.rule:
>>>>> java.lang.NullPointerException
>>>>> at
>>>>> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
>>>>> at
>>>>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)
>>>>> at
>>>>> org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)
>>>>> at
>>>>> org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)
>>>>> at
>>>>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
>>>>> at
>>>>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
>>>>> at
>>>>> org.drools.planner.core.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:177)
>>>>> at
>>>>> org.drools.planner.core.solver.scope.DefaultSolverScope.calculateScore(DefaultSolverScope.java:92)
>>>>> at
>>>>> org.drools.planner.core.phase.AbstractSolverPhaseScope.calculateScore(AbstractSolverPhaseScope.java:120)
>>>>> at
>>>>> org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.processMove(DefaultGreedyDecider.java:136)
>>>>> at
>>>>> org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.doMove(DefaultGreedyDecider.java:110)
>>>>> at
>>>>> org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.decideNextStep(DefaultGreedyDecider.java:82)
>>>>> at
>>>>> org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:65)
>>>>> at
>>>>> org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)
>>>>> at
>>>>> org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:155)
>>>>> at com.swa.planner.domain.CloudTest.main(CloudTest.java:65)
>>>>> Caused by: java.lang.NullPointerException
>>>>> at java.lang.String.<init>(Unknown Source)
>>>>> at org.mvel2.util.ErrorUtil.rewriteIfNeeded(ErrorUtil.java:12)
>>>>> at
>>>>> org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:302)
>>>>> at
>>>>> org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)
>>>>> at org.mvel2.MVEL.compileExpression(MVEL.java:810)
>>>>> at
>>>>> org.drools.base.mvel.MVELCompilationUnit.compile(MVELCompilationUnit.java:435)
>>>>> at
>>>>> org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238)
>>>>> at
>>>>> org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:206)
>>>>> at
>>>>> org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190)
>>>>> at
>>>>> org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157)
>>>>> at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)
>>>>> at
>>>>> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
>>>>> at
>>>>> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
>>>>> at
>>>>> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
>>>>> at
>>>>> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
>>>>> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
>>>>> at
>>>>> org.drools.common.SimpleBeliefSystem.insert(SimpleBeliefSystem.java:38)
>>>>> at
>>>>> org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:204)
>>>>> at
>>>>> org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:176)
>>>>> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:231)
>>>>> at
>>>>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
>>>>> at
>>>>> org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:245)
>>>>> at
>>>>> org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:210)
>>>>> at
>>>>> org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:205)
>>>>> at
>>>>> com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bd.defaultConsequence(Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bd.java:14)
>>>>> at
>>>>> com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bdDefaultConsequenceInvokerGenerated.evaluate(Unknown
>>>>> Source)
>>>>> at
>>>>> com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bdDefaultConsequenceInvoker.evaluate(Unknown
>>>>> Source)
>>>>> at
>>>>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
>>>>> ... 14 more
>>>>>
>>>>> -----------------
>>>>>
>>>>> this one i have no clue
>>>>>
>>>>>
>>>>> 2013/1/28 André Fróes <arfmoraes at gmail.com>
>>>>>
>>>>>> Hello there, i'm getting this error:
>>>>>>
>>>>>> -------------------
>>>>>> 11:26:50.394 [main] INFO o.d.p.core.solver.DefaultSolver - Solving
>>>>>> started: time spend (187), score (null), new best score (null), random seed
>>>>>> (0).
>>>>>> 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.
>>>>>> at
>>>>>> org.drools.planner.core.heuristic.selector.entity.PlanningEntitySelector.validate(PlanningEntitySelector.java:53)
>>>>>> at
>>>>>> org.drools.planner.core.heuristic.selector.entity.PlanningEntitySelector.phaseStarted(PlanningEntitySelector.java:45)
>>>>>> at
>>>>>> org.drools.planner.core.constructionheuristic.greedyFit.selector.GreedyPlanningEntitySelector.phaseStarted(GreedyPlanningEntitySelector.java:41)
>>>>>> at
>>>>>> org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.phaseStarted(DefaultGreedyFitSolverPhase.java:111)
>>>>>> at
>>>>>> org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:57)
>>>>>> at
>>>>>> org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)
>>>>>> at
>>>>>> org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:155)
>>>>>> at com.swa.planner.domain.CloudTest.main(CloudTest.java:51)
>>>>>> -------------------------
>>>>>>
>>>>>> 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?
>>>>>>
>>>>>> I'm reproducing the example from the guide, when it passes the
>>>>>> drools rules it gives that message. I didn't implement
>>>>>> CloudComputerStrengthComparator neither CloudProcessDifficultyComparator,
>>>>>> will I have to implement those so this example works?
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
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