[jboss-jira] [JBoss JIRA] (DROOLS-857) NullPointerException error needs to be improved

[Hannah Rosen (JIRA)]

Hannah Rosen created DROOLS-857:
-----------------------------------

             Summary: NullPointerException error needs to be improved
                 Key: DROOLS-857
                 URL: https://issues.jboss.org/browse/DROOLS-857
             Project: Drools
          Issue Type: Bug
         Environment: Java Eclipse
            Reporter: Hannah Rosen
            Assignee: Mark Proctor


I am changing around the dinner party example in OptaPlanner and have added a new score rule to the drl:

{code}
 rule "sameSleepingPreference"
 	when
 		$leftDesignation : SeatDesignation($leftGuest : guest)
      	$rightDesignation : SeatDesignation(isRightOf($leftDesignation), $rightGuest : guest)
      
           eval($leftGuest.sleepingPreference.equals($rightGuest.sleepingPreference))
          
    then
        	scoreHolder.addConstraintMatch(kcontext, +1);
 end 
{code}

 When I run the program with a data sheet of four people, it works fine. However, when I try it with a data sheet of 144 peopIe, I get this null pointer exception: 

{code:borderStyle=solid}
2015-07-23 10:41:59,414 [AWT-EventQueue-0] INFO  Opened: data\dinnerparty\unsolved\hannahWeddingTest.xml
2015-07-23 10:42:01,012 [SwingWorker-pool-4-thread-1] INFO  Solving started: time spent (97), best score (uninitialized/-14400), environment mode (REPRODUCIBLE), random (JDK with seed 0).
Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Solving failed.
    at org.optaplanner.examples.common.swingui.SolverAndPersistenceFrame$SolveWorker.done(SolverAndPersistenceFrame.java:297)
    at javax.swing.SwingWorker$5.run(Unknown Source)
    at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(Unknown Source)
    at sun.swing.AccumulativeRunnable.run(Unknown Source)
    at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(Unknown Source)
    at javax.swing.Timer.fireActionPerformed(Unknown Source)
    at javax.swing.Timer$DoPostEvent.run(Unknown Source)
    at java.awt.event.InvocationEvent.dispatch(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$300(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.RuntimeException: org.optaplanner.examples.dinnerparty.solver.Rule_sameSleepingPreference1438171934Eval0Invoker at a59a25b3 : java.lang.NullPointerException
    at org.drools.core.rule.EvalCondition.isAllowed(EvalCondition.java:123)
    at org.drools.core.phreak.PhreakEvalNode.doLeftInserts(PhreakEvalNode.java:55)
    at org.drools.core.phreak.PhreakEvalNode.doNode(PhreakEvalNode.java:39)
    at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:342)
    at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161)
    at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116)
    at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:231)
    at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:106)
    at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1016)
    at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1302)
    at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1289)
    at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1262)
    at org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:87)
    at org.optaplanner.examples.dinnerparty.solver.solution.initializer.DinnerPartySolutionInitializer.initializeSeatDesignationList(DinnerPartySolutionInitializer.java:69)
    at org.optaplanner.examples.dinnerparty.solver.solution.initializer.DinnerPartySolutionInitializer.changeWorkingSolution(DinnerPartySolutionInitializer.java:41)
    at org.optaplanner.core.impl.phase.custom.DefaultCustomPhase.doStep(DefaultCustomPhase.java:78)
    at org.optaplanner.core.impl.phase.custom.DefaultCustomPhase.solve(DefaultCustomPhase.java:60)
    at org.optaplanner.core.impl.solver.DefaultSolver.runPhases(DefaultSolver.java:213)
    at org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:176)
    at org.optaplanner.examples.common.business.SolutionBusiness.solve(SolutionBusiness.java:302)
    at org.optaplanner.examples.common.swingui.SolverAndPersistenceFrame$SolveWorker.doInBackground(SolverAndPersistenceFrame.java:286)
    at org.optaplanner.examples.common.swingui.SolverAndPersistenceFrame$SolveWorker.doInBackground(SolverAndPersistenceFrame.java:1)
    at javax.swing.SwingWorker$1.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at javax.swing.SwingWorker.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
    at org.optaplanner.examples.dinnerparty.solver.Rule_sameSleepingPreference1438171934.eval0(Rule_sameSleepingPreference1438171934.java:8)
    at org.optaplanner.examples.dinnerparty.solver.Rule_sameSleepingPreference1438171934Eval0InvokerGenerated.evaluate(Unknown Source)
    at org.optaplanner.examples.dinnerparty.solver.Rule_sameSleepingPreference1438171934Eval0Invoker.evaluate(Unknown Source)
    at org.drools.core.rule.EvalCondition.isAllowed(EvalCondition.java:118)
    ... 27 more `
{code}

I asked for help on StackOverflow, and Geoffrey, the OptaPlanner creator, told me to report this, as the last nullpointerexception was not specific enough and the error message should be improved.



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