[jboss-user] [JBoss jBPM] - ProcessClassloader question
sarishjain
do-not-reply at jboss.com
Tue May 12 16:01:22 EDT 2009
Please bear with me if this is a duplicate post.
I need a way to disable use of processclassloader for process execution
Or any alternative approach to solve the below issue.
The issue as i see it is that Processclassloader is assigned as the classloader in Thread executing the process and it simply fails with a throwable if the class looked for is not there in database. The calling code does not get a chance to recover from the exception(caller of that code is probably expecting ClassNotFoundException).
I have run into a few issues because of above in JBPM 3.2.6SP1, The stacktrace always ends in NullpointerException in FileDefinition.getBytesFromDb.
This is the error i got today... I am trying to invoke an EJB within actionhandler which has long(native) as input. When container is trying to serialize for the method call,the processclassloader is not able to locate the required class and fails with stack as below.
Appreciate quick help on this one!!
Thanks,
Sarish
Stack Trace
| 12:43:44,023 ERROR [GraphElement] action threw exception: couldn't get value for file 'classes/long.class'
| org.jbpm.JbpmException: couldn't get value for file 'classes/long.class'
| at org.jbpm.file.def.FileDefinition.getBytes(FileDefinition.java:196)
| at org.jbpm.instantiation.ProcessClassLoader.findClass(ProcessClassLoader.java:116)
| at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
| at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
| at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
| at org.jboss.ejb3.common.lang.SerializableMethod.getClassFromName(SerializableMethod.java:307)
| at org.jboss.ejb3.common.lang.SerializableMethod.toMethod(SerializableMethod.java:239)
| at org.jboss.ejb3.common.lang.SerializableMethod.toMethod(SerializableMethod.java:220)
| at org.jboss.ejb3.proxy.handler.ProxyInvocationHandlerBase.invoke(ProxyInvocationHandlerBase.java:236)
| at org.jboss.ejb3.proxy.handler.session.SessionSpecProxyInvocationHandlerBase.invoke(SessionSpecProxyInvocationHandlerBase.java:101)
| at $Proxy249.getPermissionBySystemId(Unknown Source)
| at com.apple.ist.ps2.server.process.rules.RuleService.getEvents(RuleService.java:226)
| at com.apple.ist.ps2.server.process.jbpm.handler.DetermineEventsHandler.execute(DetermineEventsHandler.java:22)
| at org.jbpm.graph.def.Action.execute(Action.java:125)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:585)
| at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:197)
| at org.jbpm.graph.def.Action_$$_javassist_75.execute(Action_$$_javassist_75.java)
| at org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:281)
| at org.jbpm.graph.def.Node.execute(Node.java:412)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:585)
| at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:197)
| at org.jbpm.graph.def.Node_$$_javassist_61.execute(Node_$$_javassist_61.java)
| at org.jbpm.job.ExecuteNodeJob.execute(ExecuteNodeJob.java:35)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:585)
| at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:197)
| at org.jbpm.job.Job_$$_javassist_66.execute(Job_$$_javassist_66.java)
| at org.jbpm.ejb.impl.ExecuteJobCommand.executeJob(ExecuteJobCommand.java:72)
| at org.jbpm.ejb.impl.ExecuteJobCommand.execute(ExecuteJobCommand.java:52)
| at org.jbpm.ejb.impl.CommandServiceBean.execute(CommandServiceBean.java:110)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:585)
| at org.jboss.invocation.Invocation.performCall(Invocation.java:386)
| at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:228)
| at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:156)
| at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:173)
| at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:63)
| at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:121)
| at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:350)
| at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:181)
| at org.jboss.ejb.plugins.SecurityInterceptor.process(SecurityInterceptor.java:228)
| at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:211)
| at org.jboss.ejb.plugins.security.PreSecurityInterceptor.process(PreSecurityInterceptor.java:97)
| at org.jboss.ejb.plugins.security.PreSecurityInterceptor.invoke(PreSecurityInterceptor.java:81)
| at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:205)
| at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:138)
| at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:650)
| at org.jboss.ejb.Container.invoke(Container.java:1029)
| at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:436)
| at org.jboss.ejb.plugins.local.StatelessSessionProxy.invoke(StatelessSessionProxy.java:103)
| at $Proxy238.execute(Unknown Source)
| at org.jbpm.ejb.impl.CommandListenerBean.onMessage(CommandListenerBean.java:119)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:585)
| at org.jboss.invocation.Invocation.performCall(Invocation.java:386)
| at org.jboss.ejb.MessageDrivenContainer$ContainerInterceptor.invoke(MessageDrivenContainer.java:513)
| at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:156)
| at org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor.invoke(MessageDrivenInstanceInterceptor.java:115)
| at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:63)
| at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:121)
| at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:350)
| at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:181)
| at org.jboss.ejb.plugins.RunAsSecurityInterceptor.process(RunAsSecurityInterceptor.java:133)
| at org.jboss.ejb.plugins.RunAsSecurityInterceptor.invoke(RunAsSecurityInterceptor.java:103)
| at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:205)
| at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:138)
| at org.jboss.ejb.MessageDrivenContainer.internalInvoke(MessageDrivenContainer.java:415)
| at org.jboss.ejb.Container.invoke(Container.java:1029)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:585)
| at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
| at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
| at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
| at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
| at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
| at org.jboss.invocation.local.LocalInvoker$MBeanServerAction.invoke(LocalInvoker.java:169)
| at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:118)
| at org.jboss.invocation.InvokerInterceptor.invokeLocal(InvokerInterceptor.java:209)
| at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:195)
| at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:61)
| at org.jboss.ejb.plugins.inflow.MessageEndpointInterceptor.delivery(MessageEndpointInterceptor.java:249)
| at org.jboss.ejb.plugins.inflow.MessageEndpointInterceptor.invoke(MessageEndpointInterceptor.java:128)
| at org.jboss.proxy.ClientMethodInterceptor.invoke(ClientMethodInterceptor.java:74)
| at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:101)
| at $Proxy246.onMessage(Unknown Source)
| at org.jboss.resource.adapter.jms.inflow.JmsServerSession.onMessage(JmsServerSession.java:178)
| at org.jboss.jms.client.container.ClientConsumer.callOnMessageStatic(ClientConsumer.java:160)
| at org.jboss.jms.client.container.SessionAspect.handleRun(SessionAspect.java:831)
| at org.jboss.aop.advice.org.jboss.jms.client.container.SessionAspect_z_handleRun_8818949.invoke(SessionAspect_z_handleRun_8818949.java)
| at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
| at org.jboss.jms.client.container.ClosedInterceptor.invoke(ClosedInterceptor.java:170)
| at org.jboss.aop.advice.PerInstanceInterceptor.invoke(PerInstanceInterceptor.java:86)
| at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
| at org.jboss.jms.client.delegate.ClientSessionDelegate.run(ClientSessionDelegate.java)
| at org.jboss.jms.client.JBossSession.run(JBossSession.java:199)
| at org.jboss.resource.adapter.jms.inflow.JmsServerSession.run(JmsServerSession.java:234)
| at org.jboss.resource.work.WorkWrapper.execute(WorkWrapper.java:213)
| at org.jboss.util.threadpool.BasicTaskWrapper.run(BasicTaskWrapper.java:260)
| at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
| at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
| at java.lang.Thread.run(Thread.java:613)
| Caused by: java.lang.NullPointerException
| at org.jbpm.file.def.FileDefinition.getBytesFromDb(FileDefinition.java:213)
| at org.jbpm.file.def.FileDefinition.getBytes(FileDefinition.java:193)
| ... 114 more
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