Hello:
I am getting the following stack trace of NPE when I call a stateless session
bean method from the onMessage() of my MDB. Both MDB and SSB use CMT and MDB is
configured to listen on a remote mq provider. When i remove the SSB method call
from the onMessage(), the problem vanishes.
I am using JBoss-3.2.7. Can anyone help me in finding a solution for this ?
thanks and regards,
-- Kannan.
02:00:10,484 ERROR [LogInterceptor] RuntimeException in method: public abstract
void javax.jms.MessageListener.onMessage(javax.jms.Message)
java.lang.NullPointerException
at $Proxy176.createMaster(Unknown Source)
at
org.foo..masters.MastersSubscriberMDB.onMessage(MastersSubscriberMDB.java:76)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
org.jboss.ejb.MessageDrivenContainer$ContainerInterceptor.invoke(MessageDrivenContainer.java:458)
at
org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186)
at
org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor.invoke(MessageDrivenInstanceInterceptor.java:62)
at
org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
at
org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:284)
at
org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:150)
at
org.jboss.ejb.plugins.RunAsSecurityInterceptor.invoke(RunAsSecurityInterceptor.java:90)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192)
at
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
at
org.jboss.ejb.MessageDrivenContainer.internalInvoke(MessageDrivenContainer.java:372)
at org.jboss.ejb.Container.invoke(Container.java:709)
at
org.jboss.ejb.plugins.jms.JMSContainerInvoker.invoke(JMSContainerInvoker.java:928)
at
org.jboss.ejb.plugins.jms.JMSContainerInvoker$MessageListenerImpl.onMessage(JMSContainerInvoker.java:1205)
at
org.jboss.jms.asf.StdServerSession.onMessage(StdServerSession.java:276)
at
org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:904)
at
org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:159)
at org.jboss.mq.SpySession.run(SpySession.java:351)
at org.jboss.jms.asf.StdServerSession.run0(StdServerSession.java:200)
at org.jboss.jms.asf.StdServerSession.run(StdServerSession.java:180)
at
EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)
at java.lang.Thread.run(Thread.java:534)
02:00:10,515 ERROR [JMSContainerInvoker] Exception in JMSCI message listener
javax.ejb.EJBException: RuntimeException; CausedByException is:
null
at
org.jboss.ejb.plugins.LogInterceptor.handleException(LogInterceptor.java:382)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:196)
at
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
at
org.jboss.ejb.MessageDrivenContainer.internalInvoke(MessageDrivenContainer.java:372)
at org.jboss.ejb.Container.invoke(Container.java:709)
at
org.jboss.ejb.plugins.jms.JMSContainerInvoker.invoke(JMSContainerInvoker.java:928)
at
org.jboss.ejb.plugins.jms.JMSContainerInvoker$MessageListenerImpl.onMessage(JMSContainerInvoker.java:1205)
at
org.jboss.jms.asf.StdServerSession.onMessage(StdServerSession.java:276)
at
org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:904)
at
org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:159)
at org.jboss.mq.SpySession.run(SpySession.java:351)
at org.jboss.jms.asf.StdServerSession.run0(StdServerSession.java:200)
at org.jboss.jms.asf.StdServerSession.run(StdServerSession.java:180)
at
EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)
at java.lang.Thread.run(Thread.java:534)
java.lang.NullPointerException
at $Proxy176.createMaster(Unknown Source)
at
org.foo..masters.MastersSubscriberMDB.onMessage(MastersSubscriberMDB.java:76)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
org.jboss.ejb.MessageDrivenContainer$ContainerInterceptor.invoke(MessageDrivenContainer.java:458)
at
org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186)
at
org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor.invoke(MessageDrivenInstanceInterceptor.java:62)
at
org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
at
org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:284)
at
org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:150)
at
org.jboss.ejb.plugins.RunAsSecurityInterceptor.invoke(RunAsSecurityInterceptor.java:90)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192)
at
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
at
org.jboss.ejb.MessageDrivenContainer.internalInvoke(MessageDrivenContainer.java:372)
at org.jboss.ejb.Container.invoke(Container.java:709)
at
org.jboss.ejb.plugins.jms.JMSContainerInvoker.invoke(JMSContainerInvoker.java:928)
at
org.jboss.ejb.plugins.jms.JMSContainerInvoker$MessageListenerImpl.onMessage(JMSContainerInvoker.java:1205)
at
org.jboss.jms.asf.StdServerSession.onMessage(StdServerSession.java:276)
at
org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:904)
at
org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:159)
at org.jboss.mq.SpySession.run(SpySession.java:351)
at org.jboss.jms.asf.StdServerSession.run0(StdServerSession.java:200)
at org.jboss.jms.asf.StdServerSession.run(StdServerSession.java:180)
at
EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)
at java.lang.Thread.run(Thread.java:534)
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