[rules-users] ClassCastException when firing rules

Dean Turner dturner at franklinamerican.com
Mon Dec 1 16:59:27 EST 2008 

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

More information about the rules-users mailing list