3 Replies Latest reply on Mar 15, 2007 1:59 PM by clebert.suconic

AspectFactory and classloading

ovidiu.feodorov Dec 22, 2005 11:29 AM

I was wondering why GenericAspectFactory uses the thread context class loader by default to load aspect classes?

 public Class getClazz()
 {
 ....
 {
 clazz = Thread.currentThread().getContextClassLoader().loadClass(classname);
 }
 catch (ClassNotFoundException e)
 ....
 }

This is causing me some trouble when I deploy an MDB that needs to use a scoped Messaging instance (and there can only be a scoped Messaging instance with JBoss 4.x), because the MDB deployment is done by a "ScannerThread" whose thread context class loader is a UCL associated with the main loader repository. This UCL cannot access scoped Messaging interceptor classes and the MDB deployment fails with ClassNotFoundException.

I fixed this by temporarily replacing the ScannerThread's (and any thread's that touches the AOP stack during deployment) context class loader during deployment, but I don't like at all this solution since I don't know what else this may break due to lateral effects.

How about allowing for a pluggable classloader to use for aspect loading?

An AspectXmlLoader.deployXML(Document, URL, ClassLoader) method would help me. Does this make sense?

1. Re: AspectFactory and classloading

clebert.suconic Mar 14, 2007 2:47 PM (in response to ovidiu.feodorov)

I tested using this method Ovidiu mentioned and it worked.. my scoping problem was fixed after using this.
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2. Re: AspectFactory and classloading

clebert.suconic Mar 15, 2007 12:57 PM (in response to ovidiu.feodorov)

I had a problem with this, when loading a perVM Aspect:

java.lang.ExceptionInInitializerError
 at org.jboss.jms.server.endpoint.ServerConnectionFactoryEndpoint.createConnectionDelegateInternal(ServerConnectionFactoryEndpoint.java:238)
 at org.jboss.jms.server.endpoint.ServerConnectionFactoryEndpoint.createConnectionDelegate(ServerConnectionFactoryEndpoint.java:137)
 at org.jboss.jms.server.endpoint.advised.ConnectionFactoryAdvised.org$jboss$jms$server$endpoint$advised$ConnectionFactoryAdvised$createConnectionDelegate$aop(ConnectionFactoryAdvised.java:88)
 at org.jboss.jms.server.endpoint.advised.ConnectionFactoryAdvised.createConnectionDelegate(ConnectionFactoryAdvised.java)
 at org.jboss.jms.wireformat.ConnectionFactoryCreateConnectionDelegateRequest.serverInvoke(ConnectionFactoryCreateConnectionDelegateRequest.java:103)
 at org.jboss.jms.server.remoting.JMSServerInvocationHandler.invoke(JMSServerInvocationHandler.java:125)
 at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:734)
 at org.jboss.remoting.transport.local.LocalClientInvoker.invoke(LocalClientInvoker.java:101)
 at org.jboss.remoting.Client.invoke(Client.java:1513)
 at org.jboss.remoting.Client.invoke(Client.java:527)
 at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate.org$jboss$jms$client$delegate$ClientConnectionFactoryDelegate$createConnectionDelegate$aop(ClientConnectionFactoryDelegate.java:159)
 at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate$createConnectionDelegate_4579211046834694258.invokeNext(ClientConnectionFactoryDelegate$createConnectionDelegate_4579211046834694258.java)
 at org.jboss.jms.client.container.StateCreationAspect.handleCreateConnectionDelegate(StateCreationAspect.java:83)
 at org.jboss.aop.advice.org.jboss.jms.client.container.StateCreationAspect0.invoke(StateCreationAspect0.java)
 at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate$createConnectionDelegate_4579211046834694258.invokeNext(ClientConnectionFactoryDelegate$createConnectionDelegate_4579211046834694258.java)
 at org.jboss.jms.client.container.ExceptionInterceptor.invoke(ExceptionInterceptor.java:71)
 at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate$createConnectionDelegate_4579211046834694258.invokeNext(ClientConnectionFactoryDelegate$createConnectionDelegate_4579211046834694258.java)
 at org.jboss.jms.client.container.ClientLogInterceptor.invoke(ClientLogInterceptor.java:107)
 at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate$createConnectionDelegate_4579211046834694258.invokeNext(ClientConnectionFactoryDelegate$createConnectionDelegate_4579211046834694258.java)
 at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate.createConnectionDelegate(ClientConnectionFactoryDelegate.java)
 at org.jboss.jms.client.JBossConnectionFactory.createConnectionInternal(JBossConnectionFactory.java:205)
 at org.jboss.jms.client.JBossConnectionFactory.createQueueConnection(JBossConnectionFactory.java:101)
 at org.jboss.jms.client.JBossConnectionFactory.createQueueConnection(JBossConnectionFactory.java:95)
 at org.jboss.resource.adapter.jms.inflow.dlq.AbstractDLQHandler.setupDLQConnection(AbstractDLQHandler.java:137)
 at org.jboss.resource.adapter.jms.inflow.dlq.AbstractDLQHandler.setup(AbstractDLQHandler.java:83)
 at org.jboss.resource.adapter.jms.inflow.dlq.JBossMQDLQHandler.setup(JBossMQDLQHandler.java:48)
 at org.jboss.resource.adapter.jms.inflow.JmsActivation.setupDLQ(JmsActivation.java:359)
 at org.jboss.resource.adapter.jms.inflow.JmsActivation.setup(JmsActivation.java:305)
 at org.jboss.resource.adapter.jms.inflow.JmsActivation$SetupActivation.run(JmsActivation.java:589)
 at org.jboss.resource.work.WorkWrapper.execute(WorkWrapper.java:204)
 at org.jboss.util.threadpool.BasicTaskWrapper.run(BasicTaskWrapper.java:275)
 at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)
 at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: No ClassLoaders found for: org.jboss.jms.server.container.ServerLogInterceptor
 at org.jboss.aop.advice.GenericAspectFactory.getClazz(GenericAspectFactory.java:141)
 at org.jboss.aop.advice.GenericAspectFactory.createPerVM(GenericAspectFactory.java:152)
 at org.jboss.aop.AspectManager.createPerVmAspect(AspectManager.java:1744)
 at org.jboss.aop.AspectManager.getPerVMAspect(AspectManager.java:1726)
 at org.jboss.aop.AspectManager.getPerVMAspect(AspectManager.java:1716)
 at org.jboss.aop.advice.ScopedInterceptorFactory.create(ScopedInterceptorFactory.java:66)
 at org.jboss.aop.Advisor.createInterceptorChain(Advisor.java:613)
 at org.jboss.aop.Advisor.pointcutResolved(Advisor.java:883)
 at org.jboss.aop.Advisor.resolveMethodPointcut(Advisor.java:645)
 at org.jboss.aop.ClassAdvisor.createInterceptorChains(ClassAdvisor.java:604)
 at org.jboss.aop.ClassAdvisor.access$300(ClassAdvisor.java:82)
 at org.jboss.aop.ClassAdvisor$1.run(ClassAdvisor.java:299)
 at java.security.AccessController.doPrivileged(Native Method)
 at org.jboss.aop.ClassAdvisor.attachClass(ClassAdvisor.java:271)
 at org.jboss.aop.AspectManager.initialiseClassAdvisor(AspectManager.java:590)
 at org.jboss.aop.AspectManager.getAdvisor(AspectManager.java:578)
 at org.jboss.jms.server.endpoint.advised.ConnectionAdvised.<clinit>(ConnectionAdvised.java)
 ... 33 more
Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: org.jboss.jms.server.container.ServerLogInterceptor
 at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:511)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:405)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
 at org.jboss.aop.advice.AspectFactoryWithClassLoaderSupport.loadClass(AspectFactoryWithClassLoaderSupport.java:80)
 at org.jboss.aop.advice.GenericAspectFactory.getClazz(GenericAspectFactory.java:137)
 ... 49 more

3. Re: AspectFactory and classloading

clebert.suconic Mar 15, 2007 1:59 PM (in response to ovidiu.feodorov)

NM... I had another point where I was deploying ServerSide aspects.. just setting the classLoader fixed it.
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