[regression from 5.2.0.M1] Exception on RHS method call with null parameter --------------------------------------------------------------------------- Key: JBRULES-3097 URL: https://issues.jboss.org/browse/JBRULES-3097 Project: Drools Issue Type: Bug Security Level: Public (Everyone can see) Components: drools-core Affects Versions: 5.2.0.CR1 Reporter: Richard Calmbach Assignee: Mark Proctor At some point after Drools 5.2.0.M1, a bug was introduced that causes RHS method calls with a null argument to throw an exception at runtime. The exception does not happen with a non-null argument. This still worked in Drools 5.2.0.M1 but breaks in Drools 5.2.0.CR1: dialect "mvel" rule "ruleA" when <lhs> (assigns $record, $id) then helper.methodWith3Parameters($record, $id, null); end Drools 5.2.0.CR1 throws the following exception at runtime (names sanitized). Note the missing third argument in the "unable to resolve method" error message: org.drools.runtime.rule.ConsequenceException: rule: ruleA at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:915) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:844) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1055) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:733) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:699) at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218) at com.example.KnowledgeSessionGatewayImpl.insertEventA(KnowledgeSessionGatewayImpl.java:48) at com.example.KnowledgeSessionGatewayImpl.receive(KnowledgeSessionGatewayImpl.java:74) at com.example.events.EventFeeder$FeedJob.execute(EventFeeder.java:58) at org.drools.time.impl.PseudoClockScheduler$ScheduledJob.call(PseudoClockScheduler.java:227) at org.drools.time.impl.PseudoClockScheduler.runCallBacks(PseudoClockScheduler.java:176) at org.drools.time.impl.PseudoClockScheduler.advanceTime(PseudoClockScheduler.java:127) at com.example.RulesTestBase.advanceTime(RulesTestBase.java:140) at com.example.RulesTestBase.advanceTime(RulesTestBase.java:152) at com.example.Rules2Test.testScenarioA(Rules2Test.java:280) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:66) at org.jmock.integration.junit4.JMock$1.invoke(JMock.java:37) at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:105) at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:86) at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:94) at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:84) at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49) at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:98) at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:61) at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:54) at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34) at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44) at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:52) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49) 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) Caused by: [Error: unable to resolve method: $Proxy10.methodWith3Parameters(com.example.Record, java.lang.Long, ) [arglength=3]] [Near : {... System.out.println("Rule {" + ....}] ^ [Line: 1, Column: 1] at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:1042) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:339) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:141) at org.mvel2.optimizers.dynamic.DynamicOptimizer.optimizeAccessor(DynamicOptimizer.java:67) at org.mvel2.ast.ASTNode.optimize(ASTNode.java:161) at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:117) at org.mvel2.MVELRuntime.execute(MVELRuntime.java:87) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:125) at org.mvel2.MVEL.executeExpression(MVEL.java:960) at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:105) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:905) ... 37 more -- This message is automatically generated by JIRA. 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