[rules-users] ClassCastException when firing rules

Edson Tirelli tirelli at post.com
Tue Dec 2 13:06:38 EST 2008 

   Yes, that is correct. If the underlying class interface changed, java
will raise CCE. Rulebase must be recompiled in that case.

   []s
   Edson

2008/12/2 seemamani <seemamani at gmail.com>

>
> Thanks Dean, we have removed the AOP implementation to check if that is the
> source of the problem.
>
> Edson, Is there any chance for a ClassCastException if the fact classes in
> the application were changed, but the fact model classes that are part of
> the compiled rule package were not updated to the most recent version? But
> then it would cause exceptions consistently, right? In our case, the
> exceptions are thrown occasionally only.
>
> Thanks,
> Seema
>
>
> Dean Turner wrote:
> >
> > FYI: Spring AOP enhances objects via CGLIB when no interface is
> available.
> > If an interface is avaiable, it uses an jdk dynamic proxy.
> >
> > -----Original Message-----
> > From: rules-users-bounces at lists.jboss.org
> > [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of seemamani
> > Sent: Wednesday, November 26, 2008 11:18 AM
> > To: rules-users at lists.jboss.org
> > Subject: Re: [rules-users] ClassCastException when firing rules
> >
> >
> > 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 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(Composi
> > teObjectSinkAdapter.java:318)
> >>>        at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:145)
> >>>        at
> >>>
> >>>
> >
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(Composi
> > teObjectSinkAdapter.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.i
> > nit(ManagedStatefulSession.java:87)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.framework.rules.process.drools.ManagedStatefulSession.f
> > ireAllRules(ManagedStatefulSession.java:100)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.framework.rules.process.drools.RuleEngineImpl.execute(R
> > uleEngineImpl.java:60)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.framework.rules.interceptor.RulesInterceptor.applyAnnot
> > edRules(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(DelegatingMethodAccessorIm
> > pl.java:43)
> >>>        at java.lang.reflect.Method.invoke(Method.java:618)
> >>>        at
> >>>
> >>
> >>>
> >
> org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWi
> > thGivenArgs(AbstractAspectJAdvice.java:597)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(A
> > bstractAspectJAdvice.java:583)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAd
> > vice.java:60)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refle
> > ctiveMethodInvocation.java:171)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(Exp
> > oseInvocationInterceptor.java:89)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refle
> > ctiveMethodInvocation.java:171)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor
> > .intercept(Cglib2AopProxy.java:629)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.rules.RuleHandler$$EnhancerByCGLIB$$3ab6eda.fireUpdateP
> > ricing(<generated>)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.auction.manager.SaleEventManagerImpl.updatePricing(Sale
> > EventManagerImpl.java:2599)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfAuct
> > ion(SaleEventManagerImpl.java:1993)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfGrou
> > ndingSaleEventForHyundai(SaleEventManagerImpl.java:1783)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfGrou
> > ndingSaleEvent(SaleEventManagerImpl.java:1180)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.auction.manager.SaleEventManagerImpl.cascadeAtEndOfGrou
> > ndingSaleEvent(SaleEventManagerImpl.java:1134)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.auction.service.AuctionServiceImpl.cascadeAtEndOfGround
> > ingSaleEvent(AuctionServiceImpl.java:766)
> >>>        at sun.reflect.GeneratedMethodAccessor263.invoke(Unknown Source)
> >>>        at
> >>>
> >>>
> >
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorIm
> > pl.java:43)
> >>>        at java.lang.reflect.Method.invoke(Method.java:618)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(Ao
> > pUtils.java:304)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoi
> > nt(ReflectiveMethodInvocation.java:182)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refle
> > ctiveMethodInvocation.java:149)
> >>>        at
> >>>
> >>>
> >
> org.springframework.transaction.interceptor.TransactionInterceptor.invoke(
> > TransactionInterceptor.java:106)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refle
> > ctiveMethodInvocation.java:171)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.procee
> > d(MethodInvocationProceedingJoinPoint.java:77)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.framework.logging.LoggingInterceptor.profileLog(Logging
> > Interceptor.java:136)
> >>>        at sun.reflect.GeneratedMethodAccessor74.invoke(Unknown Source)
> >>>        at
> >>>
> >>>
> >
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorIm
> > pl.java:43)
> >>>        at java.lang.reflect.Method.invoke(Method.java:618)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWi
> > thGivenArgs(AbstractAspectJAdvice.java:597)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(A
> > bstractAspectJAdvice.java:583)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAd
> > vice.java:60)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refle
> > ctiveMethodInvocation.java:171)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.
> > invoke(AfterReturningAdviceInterceptor.java:50)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refle
> > ctiveMethodInvocation.java:171)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJA
> > fterThrowingAdvice.java:54)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refle
> > ctiveMethodInvocation.java:171)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.in
> > voke(MethodBeforeAdviceInterceptor.java:50)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refle
> > ctiveMethodInvocation.java:171)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJA
> > fterThrowingAdvice.java:54)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refle
> > ctiveMethodInvocation.java:171)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(Exp
> > oseInvocationInterceptor.java:89)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refle
> > ctiveMethodInvocation.java:171)
> >>>        at
> >>>
> >>>
> >
> org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopP
> > roxy.java:204)
> >>>        at $Proxy58.cascadeAtEndOfGroundingSaleEvent(Unknown Source)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.pricing.ejb.PricingBean.updateMBPPrice(PricingBean.java
> > :112)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.pricing.ejb.EJSRemoteStatelessPricing_a0966b04.updateMB
> > PPrice(EJSRemoteStatelessPricing_a0966b04.java:183)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.pricing.ejb._EJSRemoteStatelessPricing_a0966b04_Tie.upd
> > ateMBPPrice(_EJSRemoteStatelessPricing_a0966b04_Tie.java:243)
> >>>        at
> >>>
> >>>
> >
> com.adesa.business.pricing.ejb._EJSRemoteStatelessPricing_a0966b04_Tie._in
> > voke(_EJSRemoteStatelessPricing_a0966b04_Tie.java:108)
> >>>        at
> >>>
> >>>
> >
> com.ibm.CORBA.iiop.ServerDelegate.dispatchInvokeHandler(ServerDelegate.jav
> > a:621)
> >>>        at
> >>> com.ibm.CORBA.iiop.ServerDelegate.dispatch(ServerDelegate.java:474)
> >>>        at com.ibm.rmi.iiop.ORB.process(ORB.java:503)
> >>>        at com.ibm.CORBA.iiop.ORB.process(ORB.java:1571)
> >>>        at com.ibm.rmi.iiop.Connection.respondTo(Connection.java:2701)
> >>>        at com.ibm.rmi.iiop.Connection.doWork(Connection.java:2575)
> >>>        at com.ibm.rmi.iiop.WorkUnitImpl.doWork(WorkUnitImpl.java:62)
> >>>        at com.ibm.ejs.oa.pool.PooledThread.run(ThreadPool.java:118)
> >>>        at com.ibm.ws.util.ThreadPool$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(VariableD
> > eepPropertyNode.java:22)
> >>>        at
> >>>
> >>>
> >
> org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.ja
> > va:21)
> >>>        at
> >>>
> >>>
> >
> org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.ja
> > va: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(MVELPredicateExpress
> > ion.java:45)
> >>>        at
> >>>
> >
> org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:209
> > )
> >>> --
> >>> View this message in context:
> >>>
> >
> http://www.nabble.com/ClassCastException-when-firing-rules-tp20694738p2069
> > 4738.html
> >>> Sent from the drools - user mailing list archive at Nabble.com.
> >>>
> >>> _______________________________________________
> >>> rules-users mailing list
> >>> rules-users at lists.jboss.org
> >>> https://lists.jboss.org/mailman/listinfo/rules-users
> >>>
> >>
> >>
> >>
> >> --
> >>  Edson Tirelli
> >>  JBoss Drools Core Development
> >>  JBoss, a division of Red Hat @ www.jboss.com
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users at lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >>
> >
> > --
> > View this message in context:
> >
> http://www.nabble.com/Occasional-ClassCastException-when-firing-rules-tp20
> > 694738p20705144.html
> > Sent from the drools - user mailing list archive at Nabble.com.
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Occasional-ClassCastException-when-firing-rules-tp20694738p20794410.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>



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