[rules-users] Accumulate and Serializable

[Steve Ronderos]

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
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