[rules-users] ClassCastException when firing rules
seemamani
seemamani at gmail.com
Thu Apr 2 13:07:52 EDT 2009
hi Edson.
This is in continuation with the below issue that I had posted a few months
back. Even though we removed Spring AOP from the application then, the
problem still occurs at times. I was wondering if Hibernate was the culprit,
but fail to understand why it is not consistently happening.
The Inventory object which is causing the ClassCastException is a Hibernate
proxy since it is lazy loaded. The injected fact contains a reference to
this Inventory. So I was wondering if the issue has something to do with
shadow fact creation. When the shadow is created for a fact that contains a
Hibernate proxy, is there any possibility of this problem?
Thanks,
Seema
Edson Tirelli-3 wrote:
>
> Hi Seema,
>
> Your rules look fine, and the reason you see an "eval" in the
> exception
> text is that this:
>
> inventory.leaseInformation != null
>
> Is resolved as an eval.
>
> Anyway, drools does *not* use CGLIB. We generate bytecode directly
> using ASM. No CGLIB in the middle.
>
> The problem, whatever it is, is related to the pojo model and any of
> these frameworks interfering with it. So, if you can create an isolated
> test
> case that allow us to reproduce the problem, it will help us understand
> how
> can we support your scenario of usage.
>
> Thanks,
> Edson
>
> 2008/11/26 seemamani <seemamani at gmail.com>
>
>>
>> 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(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 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-tp20694738p20705144.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-tp20694738p22851211.html
Sent from the drools - user mailing list archive at Nabble.com.
More information about the rules-users
mailing list