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

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java.lang.NullPointerException:
at oracle.oc4j.persistence.PolicyClassLoaderAdapter.getTemporaryClassLoader(PolicyClassLoaderAdapter.java:30)
at oracle.oc4j.persistence.PersistenceUnitInfoImpl.getNewTempClassLoader(PersistenceUnitInfoImpl.java:350)
at oracle.toplink.internal.ejb.cmp3.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:641)
at oracle.toplink.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:198)

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