java.lang.NullPointerException at org.mvel2.ast.IntSub.getReducedValueAccelerated --------------------------------------------------------------------------------- Key: JBRULES-3718 URL: https://issues.jboss.org/browse/JBRULES-3718 Project: JBRULES Issue Type: Bug Security Level: Public(Everyone can see) Components: drools-core Affects Versions: 5.5.0.Final Environment: Windows 7 64bit - Java 1.7.0 Drools-planner 5.5.0.Final -> Drools-core 5.5.0.Final -> mvel2 2.1.3.Final Reporter: Michiel Vermandel Assignee: Mario Fusco When I run my planning I get now and then the stacktrace as mentioned below. It happens about 1 in 5 times during running a JUnit test on small amount of planning entities and problem facts. It started after adding my last rule: rule "tasksInSameCommunityMustBeChained" when $lead : Task(this==lead, period!=null, communityId!= null, $communityId : communityId) not ( Task(this==lead, communityId == $communityId, id != $lead.id, ($lead.startPeriodId-1) <= endPeriodId && ($lead.endPeriodId+1) >= startPeriodId ) ) then insertLogical(new IntConstraintOccurrence("tasksInSameCommunityMustBeChained", ConstraintType.NEGATIVE_HARD, Importance.chainedPeriod, $communityId, $lead, $lead.getStartPeriodId())); end Stack trace: Exception in thread "Thread-1" java.lang.NullPointerException at org.mvel2.ast.IntSub.getReducedValueAccelerated(IntSub.java:17) at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:38) at org.mvel2.ast.Substatement.getReducedValueAccelerated(Substatement.java:44) at org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:108) at org.mvel2.ast.And.getReducedValueAccelerated(And.java:34) at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85) at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:113) at org.mvel2.MVEL.executeExpression(MVEL.java:930) at org.drools.rule.constraint.MvelConditionEvaluator.evaluate(MvelConditionEvaluator.java:70) at org.drools.rule.constraint.MvelConditionEvaluator.ensureBranchEvaluation(MvelConditionEvaluator.java:117) at org.drools.rule.constraint.MvelConditionEvaluator.ensureCompleteEvaluation(MvelConditionEvaluator.java:102) at org.drools.rule.constraint.MvelConditionEvaluator.ensureCompleteEvaluation(MvelConditionEvaluator.java:90) at org.drools.rule.constraint.MvelConditionEvaluator.getAnalyzedCondition(MvelConditionEvaluator.java:82) at org.drools.rule.constraint.MvelConstraint.executeJitting(MvelConstraint.java:270) at org.drools.rule.constraint.MvelConstraint.access$200(MvelConstraint.java:51) at org.drools.rule.constraint.MvelConstraint$ConditionJitter.run(MvelConstraint.java:250) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)