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Re: ClassCastException when firing rules

by seemamani :: Rate this Message:

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Edson,

We are not sure how the CGLIB proxy is getting created. We were under the impression that it is the shadow fact proxy generated by Drools itself. I would like to share a few more points about our application in case they are somehow related to this problem.

1. We are using Spring AOP for intercepting method calls and passing the facts, globals etc to a class that invoke Drools. Version of Spring is 2.0.7
2. We are using Hibernate 3.x/JPA for persistence. In fact the Inventory POJO that is causing the ClassCastException is a JPA entity
3. We have rules defined in multiple packages. The Inventory POJO is used by rules in all the packages. But the exception is occurring only for rules in a particular package. That too only occasionally.

Please let me know if any other information is required.

Thanks,
Seema

Edson Tirelli-3 wrote:
   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@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)
> --
> View this message in context:
> http://www.nabble.com/ClassCastException-when-firing-rules-tp20694738p20694738.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
> _______________________________________________
> rules-users mailing list
> rules-users@lists.jboss.org
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>



--
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com

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