NPE's stacktrace for an MvelConstraint.evaluate() should give a line number from the source DRL file ---------------------------------------------------------------------------------------------------- Key: DROOLS-1071 URL: https://issues.jboss.org/browse/DROOLS-1071 Project: Drools Issue Type: Enhancement Components: core engine Affects Versions: 6.3.0.Final, 6.4.0.Beta2 Environment: JDK: Java 7 OS: Mac OSX 10.10.2 IDE: Spring Tool Suite 3.6.4 Reporter: Ido Flax Assignee: Mario Fusco Attachments: AbstractPlannerDto.java, activity-scoring.drl, EquipmentEquipmentTypesPlannerDto.java, LabourDayOffPlannerDto.java, OnHandForProduct.java, ProductInventoryTransactionPlannerDto.java, ProductPlannerDto.java, SkillsAndRatesPlannerDto.java, TaskPlannerDto.java, TaskResourceAllocationPlannerDto.java, TaskResourcePlannerDto.java, UserPlannerDto.java The attached code generates an NPE when running optaplanner/drools, but that stacktrace doesn't tell me which DRL line is responsible for it. Stacktrace: {code:java} Caused by: java.lang.NullPointerException: null at ConditionEvaluatoreaa3997683d949e28ce6eaf6feca0ced.evaluate(Unknown Source) <================ No source DRL line at org.drools.core.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:258) at org.drools.core.rule.constraint.MvelConstraint.isAllowedCachedLeft(MvelConstraint.java:226) at org.drools.core.common.DoubleBetaConstraints.isAllowedCachedLeft(DoubleBetaConstraints.java:111) at org.drools.core.phreak.PhreakJoinNode.doLeftInserts(PhreakJoinNode.java:112) at org.drools.core.phreak.PhreakJoinNode.doNode(PhreakJoinNode.java:75) at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:547) at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:533) at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:369) at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:329) at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:163) at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:120) at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:194) at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:73) at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1003) at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1346) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1284) at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1303) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1293) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1274) at org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:84) at org.optaplanner.core.impl.solver.recaller.BestSolutionRecaller.solvingStarted(BestSolutionRecaller.java:70) at org.optaplanner.core.impl.solver.DefaultSolver.solvingStarted(DefaultSolver.java:197) at org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:175) {code}