[rules-users] ClassCastException when firing rules

Edson Tirelli tirelli at post.com
Wed Nov 26 09:38:26 EST 2008 

   What are you guys doing with CGLIB? or is this WebSphere doing some
sneaky thing behind the scenes? Or is it SpringAOP doing sneaky things?

Caused by:
java.lang.ClassCastException: com.adesa.data.grounding.pojo.Inventory
incompatible with
com.adesa.data.grounding.pojo.Inventory$$EnhancerByCGLIB$$de81aab3

   At compile time we determine that "inventory" is a
com.adesa.data.grounding.pojo.Inventory. If at runtime what arrives into the
expression is a
com.adesa.data.grounding.pojo.Inventory$$EnhancerByCGLIB$$de81aab3,
and it is not a proper subclass, you might get such problems.

   Having said that, I will talk to Mike to check if this can be prevented
somehow, but I really don't know if it will be possible...

   []s
   Edson



2008/11/25 seemamani <seemamani at gmail.com>

>
> hi,
>
> We are using Drools 4.0.7 in a web application deployed in WebSphere 6.1.
> Occasionally, we have rule engine failure caused by RuntimeDroolsException
> (whose root cause is shown as ClassCastException) when firing rules. Other
> times, the rules are executing without errors. Here is the stack trace of
> the exception. What are the possible reasons?
>
> Thanks,
> Seema
>
> org.drools.RuntimeDroolsException: Exception executing predicate eval(
> inventory.leaseInformation != null )
>        at
> org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:216)
>        at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)
>        at
>
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318)
>        at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:145)
>        at
>
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318)
>        at
> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:162)
>        at org.drools.reteoo.Rete.assertObject(Rete.java:175)
>        at
> org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192)
>        at
> org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)
>        at
>
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:911)
>        at
>
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:883)
>        at
>
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:684)
>        at
>
> com.adesa.business.framework.rules.process.drools.ManagedStatefulSession.init(ManagedStatefulSession.java:87)
>        at
>
> com.adesa.business.framework.rules.process.drools.ManagedStatefulSession.fireAllRules(ManagedStatefulSession.java:100)
>        at
>
> com.adesa.business.framework.rules.process.drools.RuleEngineImpl.execute(RuleEngineImpl.java:60)
>        at
>
> com.adesa.business.framework.rules.interceptor.RulesInterceptor.applyAnnotedRules(RulesInterceptor.java:109)
>        at
>
> com.adesa.business.framework.rules.interceptor.RulesInterceptor.applyRules(RulesInterceptor.java:80)
>        at sun.reflect.GeneratedMethodAccessor575.invoke(Unknown Source)
>        at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>        at java.lang.reflect.Method.invoke(Method.java:618)
>        at
>
> org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:597)
>        at
>
> org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:583)
>        at
>
> org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:60)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>        at
>
> org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>        at
>
> org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:629)
>        at
>
> com.adesa.business.rules.RuleHandler$$EnhancerByCGLIB$$3ab6eda.fireUpdatePricing(<generated>)
>        at
>
> com.adesa.business.auction.manager.SaleEventManagerImpl.updatePricing(SaleEventManagerImpl.java:2599)
>        at
>
> com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfAuction(SaleEventManagerImpl.java:1993)
>        at
>
> com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfGroundingSaleEventForHyundai(SaleEventManagerImpl.java:1783)
>        at
>
> com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfGroundingSaleEvent(SaleEventManagerImpl.java:1180)
>        at
>
> com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfGroundingSaleEvent(SaleEventManagerImpl.java:1134)
>        at
>
> com.adesa.business.auction.service.AuctionServiceImpl.cascadeAtEndOfGroundingSaleEvent(AuctionServiceImpl.java:766)
>        at sun.reflect.GeneratedMethodAccessor263.invoke(Unknown Source)
>        at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>        at java.lang.reflect.Method.invoke(Method.java:618)
>        at
>
> org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
>        at
>
> org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>        at
>
> org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:77)
>        at
>
> com.adesa.business.framework.logging.LoggingInterceptor.profileLog(LoggingInterceptor.java:136)
>        at sun.reflect.GeneratedMethodAccessor74.invoke(Unknown Source)
>        at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>        at java.lang.reflect.Method.invoke(Method.java:618)
>        at
>
> org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:597)
>        at
>
> org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:583)
>        at
>
> org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:60)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>        at
>
> org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:50)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>        at
>
> org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:54)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>        at
>
> org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:50)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>        at
>
> org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:54)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>        at
>
> org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
>        at
>
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>        at
>
> org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
>        at $Proxy58.cascadeAtEndOfGroundingSaleEvent(Unknown Source)
>        at
>
> com.adesa.business.pricing.ejb.PricingBean.updateMBPPrice(PricingBean.java:112)
>        at
>
> com.adesa.business.pricing.ejb.EJSRemoteStatelessPricing_a0966b04.updateMBPPrice(EJSRemoteStatelessPricing_a0966b04.java:183)
>        at
>
> com.adesa.business.pricing.ejb._EJSRemoteStatelessPricing_a0966b04_Tie.updateMBPPrice(_EJSRemoteStatelessPricing_a0966b04_Tie.java:243)
>        at
>
> com.adesa.business.pricing.ejb._EJSRemoteStatelessPricing_a0966b04_Tie._invoke(_EJSRemoteStatelessPricing_a0966b04_Tie.java:108)
>        at
>
> com.ibm.CORBA.iiop.ServerDelegate.dispatchInvokeHandler(ServerDelegate.java:621)
>        at
> com.ibm.CORBA.iiop.ServerDelegate.dispatch(ServerDelegate.java:474)
>        at com.ibm.rmi.iiop.ORB.process(ORB.java:503)
>        at com.ibm.CORBA.iiop.ORB.process(ORB.java:1571)
>        at com.ibm.rmi.iiop.Connection.respondTo(Connection.java:2701)
>        at com.ibm.rmi.iiop.Connection.doWork(Connection.java:2575)
>        at com.ibm.rmi.iiop.WorkUnitImpl.doWork(WorkUnitImpl.java:62)
>        at com.ibm.ejs.oa.pool.PooledThread.run(ThreadPool.java:118)
>        at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473)
> Caused by:
> java.lang.ClassCastException: com.adesa.data.grounding.pojo.Inventory
> incompatible with
> com.adesa.data.grounding.pojo.Inventory$$EnhancerByCGLIB$$de81aab3
>        at ASMAccessorImpl_11448003161226563261710.getValue(Unknown Source)
>        at
>
> org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode.java:22)
>        at
>
> org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:21)
>        at
>
> org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21)
>        at org.mvel.MVELRuntime.execute(MVELRuntime.java:90)
>        at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
>        at org.mvel.MVEL.executeExpression(MVEL.java:235)
>        at
>
> org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:45)
>        at
> org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:209)
> --
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>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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