Accumulate Function ClassCastException -------------------------------------- Key: DROOLS-839 URL: https://issues.jboss.org/browse/DROOLS-839 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 6.2.0.CR4, 6.3.0.Beta1 Environment: Mac OS X 10.10.3 Reporter: Eugene Shvartsman Assignee: Mario Fusco Fix For: 6.3.0.CR1 Attachments: Drools-839-Reproducer.zip I am getting a ClassCastException with the following LHS side of the rule. The sample I am posting is the simplest version of the rule that I could create while still retaining the error. {code:title=Rule.drl|borderStyle=solid} rule "reproducer" dialect "mvel" enabled true when $contract : Contract( $contractRefId : contractRefId, $scope : scope ) (or $employee : Employee ($scope == ContractScope.EmployeeContract && employeeId == $contractRefId) $employee : Employee ($scope == ContractScope.TeamContract) ) $contractLine : MinMaxContractLine( contractLineType == ContractLineType.HOURS_PER_DAY, $maxMinutesValue : maximumValue, $weight : maximumWeight, maximumEnabled == true, $contract == contract) $info : EmployeeRosterInfo( $type : profileDayType, $firstDayOfWeek : firstDayOfWeek ) $shiftDate : ShiftDate(isInPlanningWindow($info)) accumulate ( $shift : ShiftAssignment( employee != null, employee == $employee ,getDateByProfileDayType($type).equals($shiftDate) ,$minutes : shiftDurationMinutes) ,$minutesInDay : sum( $shift.getShiftDurationMinutesByProfileType($type, $shiftDate) ) ,$shiftsInvolved : collectList($shift) ) then end {code} During the execution of the rules I get the following stack trace: {code:title=StackTrace.java|borderStyle=solid} java.lang.RuntimeException: java.lang.ClassCastException: com.reproducer.engine.domain.contract.Contract cannot be cast to com.reproducer.engine.domain.EmployeeRosterInfo at org.drools.core.rule.MultiAccumulate.accumulate(MultiAccumulate.java:99) at org.drools.core.phreak.PhreakAccumulateNode.addMatch(PhreakAccumulateNode.java:751) at org.drools.core.phreak.PhreakAccumulateNode.doLeftInserts(PhreakAccumulateNode.java:163) at org.drools.core.phreak.PhreakAccumulateNode.doNode(PhreakAccumulateNode.java:80) at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:562) at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:533) at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:334) 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:1008) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1294) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1289) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1262) at com.engine.drools.hardconstraints.MaxHoursPerDayTester.testMaxHoursTwoShiftsViolatedSplitByMidnightType(MaxHoursPerDayTester.java:67) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.junit.runners.ParentRunner.run(ParentRunner.java:292) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) Caused by: java.lang.ClassCastException: com.reproducer.engine.domain.contract.Contract cannot be cast to com.reproducer.engine.domain.EmployeeRosterInfo at org.drools.base.com.reproducer.engine.domain.EmployeeRosterInfo1136687844$getProfileDayType.getValue(Unknown Source) at org.drools.core.base.ClassFieldReader.getValue(ClassFieldReader.java:91) at org.drools.core.rule.Declaration.getValue(Declaration.java:228) at org.drools.core.base.mvel.MVELCompilationUnit.updateFactory(MVELCompilationUnit.java:359) at org.drools.core.base.mvel.MVELCompilationUnit.getFactory(MVELCompilationUnit.java:291) at org.drools.core.base.accumulators.MVELAccumulatorFunctionExecutor.accumulate(MVELAccumulatorFunctionExecutor.java:116) at org.drools.core.rule.MultiAccumulate.accumulate(MultiAccumulate.java:90) ... 40 more {code} If I remove the 'or' clause from the rule by commenting out the lines as below, the error goes away. {code:title=Error.java|borderStyle=solid} $contract : Contract( $contractRefId : contractRefId, $scope : scope ) // (or $employee : Employee ($scope == ContractScope.EmployeeContract && employeeId == $contractRefId) // $employee : Employee ($scope == ContractScope.TeamContract) // ) {code}