[rules-users] ClassCastException when firing rules
seemamani
seemamani at gmail.com
Wed Nov 26 20:54:43 EST 2008
Edson,
Thanks for your reply. Reproducing the error looks difficult since it
happens only at times, but we will try. However, I noticed a bug reported in
your JIRA which also has reported a similar ClassCastException with a CGLIB
proxy.
https://jira.jboss.org/jira/browse/JBRULES-1784
It says that the bug has been fixed in version 5.0 of Drools. But it does
not mention the environment in which it was tested, so can't be sure if it
is related to our case.
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
>
>
--
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