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

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java.lang.NullPointerException:
at oracle.toplink.internal.ejb.cmp3.metadata.accessors.EmbeddedIdAccessor.processEmbeddableClass(EmbeddedIdAccessor.java:115)
at oracle.toplink.internal.ejb.cmp3.metadata.accessors.EmbeddedAccessor.process(EmbeddedAccessor.java:259)
at oracle.toplink.internal.ejb.cmp3.metadata.accessors.EmbeddedIdAccessor.process(EmbeddedIdAccessor.java:69)
at oracle.toplink.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processAccessor(ClassAccessor.java:570)
at oracle.toplink.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processAccessorFields(ClassAccessor.java:583)
at oracle.toplink.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processAccessors(ClassAccessor.java:609)
at oracle.toplink.internal.ejb.cmp3.metadata.accessors.ClassAccessor.process(ClassAccessor.java:510)
at oracle.toplink.internal.ejb.cmp3.metadata.MetadataProcessor.processAnnotations(MetadataProcessor.java:279)
at oracle.toplink.internal.ejb.cmp3.persistence.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:266)
at oracle.toplink.internal.ejb.cmp3.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:747)
at oracle.toplink.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:198)

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