Occasional ClassCastException when firing rules
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seemamani
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(This post was updated on )
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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Edson Tirelli-3
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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 <[hidden email]>
-- Edson Tirelli JBoss Drools Core Development JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list [hidden email] https://lists.jboss.org/mailman/listinfo/rules-users |
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seemamani
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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
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Dean Turner
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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: [hidden email] [mailto:[hidden email]] On Behalf Of seemamani Sent: Wednesday, November 26, 2008 11:18 AM To: [hidden email] 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 > somehow, but I really don't know if it will be possible... > > []s > Edson > > > > 2008/11/25 seemamani <[hidden email]> > >> >> hi, >> >> We are using Drools 4.0.7 in a web application deployed in WebSphere >> 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 >> >> 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 >> [hidden email] >> 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 > [hidden email] > 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 [hidden email] https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list [hidden email] https://lists.jboss.org/mailman/listinfo/rules-users |
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seemamani
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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
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Edson Tirelli-3
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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 <[hidden email]>
-- Edson Tirelli JBoss Drools Core Development JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list [hidden email] https://lists.jboss.org/mailman/listinfo/rules-users |
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Edson Tirelli-3
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In reply to this post
by seemamani
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 <[hidden email]>
-- Edson Tirelli JBoss Drools Core Development JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list [hidden email] https://lists.jboss.org/mailman/listinfo/rules-users |
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seemamani
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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
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seemamani
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In reply to this post
by Edson Tirelli-3
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
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