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lookup failing with NPE in clustered environment

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In a clustered environment, NullPointer Exception is getting thrown whenever a specific ejb look up happens. This problem disappears after websphere restart. Following is the stack trace :

javax.naming.NamingException: Error during resolve [Root exception is java.lang.NullPointerException]
at javax.naming.InitialContext.lookup(

The websphere version is 6.1 and ejb is 2.1. This problem is happening only when the system tries to invoke the bean for the first time after installation. Could any one please help to find out the problem?

In the ibm-ejb-jar-ext.xmi, a flag startEJBAtApplicationStart is used and set to true. Is that causing this NPE?

Thanks & Regards,
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