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Problem while deploying an MDB

From: <glassfish_at_javadesktop.org>
Date: Tue, 04 Dec 2007 09:10:21 PST

I'm trying to deploy an EJB packaged on a .jar module.
It's successfully deployed but that's what i get (a periodic exception on the log file).

@Exception

[#|2007-12-04T16:03:19.495+0100|SEVERE|sun-appserver-pe9.0|javax.enterprise.system.container.ejb.mdb|_ThreadID=17;_ThreadName=p: thread-pool-1; w: 3;_RequestID=8f07761e-3bdb-4315-a904-e4855cd1af40;|java.lang.NullPointerException
java.lang.NullPointerException
        at com.sun.enterprise.util.InvocationManagerImpl.preInvoke(InvocationManagerImpl.java:139)
        at com.sun.ejb.containers.MessageBeanContainer.createMessageDrivenEJB(MessageBeanContainer.java:684)
        at com.sun.ejb.containers.MessageBeanContainer.access$100(MessageBeanContainer.java:92)
        at com.sun.ejb.containers.MessageBeanContainer$MessageBeanContextFactory.create(MessageBeanContainer.java:477)
        at com.sun.ejb.containers.util.pool.NonBlockingPool.preload(NonBlockingPool.java:267)
        at com.sun.ejb.containers.util.pool.NonBlockingPool.doResize(NonBlockingPool.java:491)
        at com.sun.ejb.containers.util.pool.NonBlockingPool$IdleBeanWork.run(NonBlockingPool.java:586)
        at com.sun.ejb.containers.util.pool.NonBlockingPool$IdleBeanWork.service(NonBlockingPool.java:578)
        at com.sun.ejb.containers.util.WorkAdapter.doWork(WorkAdapter.java:62)
        at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:479)
|#]

Can i get some help.
Thanks
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