DRL constraint on property x on a class with isX() and getX() fails with [Error: incompatible types in statement: boolean] -------------------------------------------------------------------------------------------------------------------------- Key: DROOLS-18 URL: https://issues.jboss.org/browse/DROOLS-18 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Environment: Windows 7 64Bit Java 1.7.0 Drools-core 5.5.0.Final Drools-compiler 5.5.0.Final Mvel2 2.1.3.Final Reporter: Michiel Vermandel Assignee: Mario Fusco Priority: Critical Fix For: 5.5.1.Final, 6.0.0.Final In about one out of ten JUnit runs, I get a crash with stack trace. The process terminates immediately. Unit test output is 100% the same on successful runs. Stack trace: [Error: incompatible types in statement: boolean (compared from: class be.axi.planner.domain.Task)] [Near : {... this == lead ....}] ^ [Line: 1, Column: 1] at org.mvel2.ast.BinaryOperation.<init>(BinaryOperation.java:84) at org.mvel2.util.CompilerTools.finalizePayload(CompilerTools.java:118) at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:287) at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62) at org.mvel2.MVEL.compileExpression(MVEL.java:810) at org.drools.base.mvel.MVELCompilationUnit.compile(MVELCompilationUnit.java:435) at org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238) at org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:206) at org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190) at org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157) at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137) at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235) at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847) at org.drools.planner.core.score.director.drools.DroolsScoreDirector.afterEntityAdded(DroolsScoreDirector.java:103) at org.drools.planner.core.heuristic.selector.variable.PlanningVariableWalker.moveIterator(PlanningVariableWalker.java:145) at org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.decideNextStep(DefaultGreedyDecider.java:74) at org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:65) at org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190) at org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:155) at be.axi.planner.app.InspectionSchedule.solve(InspectionSchedule.java:192) at be.axi.planner.testcore.AbstractPlanningTestClass.solve(AbstractPlanningTestClass.java:288) at be.axi.planner.testcore.AbstractPlanningTestClass.solve(AbstractPlanningTestClass.java:298) at be.axi.planner.testcore.AbstractPlanningTestClass.solve(AbstractPlanningTestClass.java:315) at be.axi.planner.TaskGroupingTest.communitySuccess02(TaskGroupingTest.java:289) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) 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.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) 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:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)