3:40 p.m.
Hello,
I've been working on upgrading an application that uses Drools 4.0.7 to
5.0.1. For the most part things have been going well.
After I got the rules running with 5.0.1 I started getting a
ClassCastException on one of my model classes within the class
MVELAccumulatorFunctionExecutor. Here is the full stacktrace
org.drools.runtime.rule.ConsequenceException:
org.drools.RuntimeDroolsException: java.lang.ClassCastException:
com.example.Slot
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:945)
at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885)
at
org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1091)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:684)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:650)
at
com.example.StatefulDroolsRuleManager.execute(StatefulDroolsRuleManager.java:59)
at
com.example.common.TestMaxQuantity.multipleMaximum4Slot(TestMaxQuantity.java:115)
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:585)
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.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
at
org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
at
org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
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.run(ParentRunner.java:220)
at
org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:62)
at
org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
at
org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
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:585)
at
org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:338)
at
org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:997)
Caused by: org.drools.RuntimeDroolsException:
java.lang.ClassCastException: com.example.Slot
at org.drools.rule.Accumulate.accumulate(Accumulate.java:172)
at
org.drools.reteoo.AccumulateNode.modifyTuple(AccumulateNode.java:432)
at
org.drools.reteoo.AccumulateNode.assertObject(AccumulateNode.java:284)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:360)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:344)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:147)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:360)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:337)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)
at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)
at
org.drools.common.AbstractWorkingMemory.modifyInsert(AbstractWorkingMemory.java:1365)
at
org.drools.base.DefaultKnowledgeHelper.modifyInsert(DefaultKnowledgeHelper.java:201)
at
org.drools.base.DefaultKnowledgeHelper.modifyInsert(DefaultKnowledgeHelper.java:195)
at
com.example.Rule_Update_Slot_s_valid_occupants_0.consequence(Rule_Update_Slot_s_valid_occupants_0.java:30)
at
com.example.Rule_Update_Slot_s_valid_occupants_0ConsequenceInvoker.evaluate(Rule_Update_Slot_s_valid_occupants_0ConsequenceInvoker.java:33)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:936)
... 34 more
Caused by: java.lang.ClassCastException: com.example.Slot
at
org.drools.base.accumulators.MVELAccumulatorFunctionExecutor.accumulate(MVELAccumulatorFunctionExecutor.java:125)
at org.drools.rule.Accumulate.accumulate(Accumulate.java:164)
... 49 more
I then downloaded the code to see what was going on and it looks like my
fact types are being cast to Serializable objects in the
MVELAccumulatorFunctionExecutor.accumulate method. I don't remember
reading anything about needing to make my model serializable, did I miss
some documentation somewhere?
Also, I found this JIRA request that looked related:
https://jira.jboss.org/jira/browse/JBRULES-2202
Any help would be greatly appreciated. Thanks!
Steve Ronderos