java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at com.sun.appserv.util.cache.BaseCache.hash(BaseCache.java:165)
at com.sun.enterprise.distributedtx.J2EETransactionManagerImpl.getResourceList(J2EETransactionManagerImpl.java:661)
at com.sun.enterprise.distributedtx.J2EETransactionManagerImpl.enlistComponentResources(J2EETransactionManagerImpl.java:476)
at com.sun.enterprise.distributedtx.J2EETransactionManagerImpl.enlistComponentResources(J2EETransactionManagerImpl.java:317)
at com.sun.enterprise.distributedtx.UserTransactionImpl.begin(UserTransactionImpl.java:102)

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