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 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} when $employee : Employee () $contractLine : MinMaxContractLine( contractLineType == ContractLineType.HOURS_PER_DAY, $maxMinutesValue : maximumValue, $weight : maximumWeight, maximumEnabled == true) $info : EmployeeRosterInfo( $type : profileDayType, $firstDayOfWeek : firstDayOfWeek ) $shiftDate : ShiftDate(isInPlanningWindow($info)) accumulate ( $shift : ShiftAssignment( employee != null, employee == $employee) ,$minutesInDay : sum($shift.getShiftDurationMinutesByProfileType($type, $shiftDate)); $minutesInDay > 0 ) then {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.x.engine.domain.ShiftDate cannot be cast to com.x.engine.domain.dto.ProfileDayType at org.drools.core.rule.SingleAccumulate.accumulate(SingleAccumulate.java:90) at org.drools.core.phreak.PhreakAccumulateNode.addMatch(PhreakAccumulateNode.java:759) 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:569) at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:540) at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:336) at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:163) at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:118) at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:194) at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:62) at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:974) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1283) at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1325) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1308) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1287) at com.x.engine.drools.hardconstraints.MaxHoursPerDayTester.testMaxHoursTwoShiftsViolatedStartDateType(MaxHoursPerDayTester.java:244) 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:47) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) 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.x.engine.domain.ShiftDate cannot be cast to com.x.engine.domain.dto.ProfileDayType at com.x.engine.solver.rules.constraints.Rule_maxHoursPerDay1799802206AccumulateExpression0Invoker.evaluate(Rule_maxHoursPerDay1799802206AccumulateExpression0Invoker.java:17) at org.drools.core.base.accumulators.JavaAccumulatorFunctionExecutor.accumulate(JavaAccumulatorFunctionExecutor.java:109) at org.drools.core.rule.SingleAccumulate.accumulate(SingleAccumulate.java:82) ... 41 more {code} If I replace $shift.getShiftDurationMinutesByProfileType($type, $shiftDate) with $shift.getShiftDurationMinutesByProfileType($type, $shift.getShiftDate()) the issue goes away for some reason. Sadly this does not work as a workaround in my real case.