[rules-users] ClassCastException when firing rules

seemamani seemamani at gmail.com
Tue Nov 25 23:47:53 EST 2008 

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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