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

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This exception has no message.
java.lang.NullPointerException:
at weblogic.ejb.container.cache.CacheKey.(CacheKey.java:26)
at weblogic.ejb.container.manager.DBManager.cacheRemoveBeanOnError(DBManager.java:2010)
at weblogic.ejb.container.manager.BaseEntityManager.cacheRemoveCMPBeansOnError(BaseEntityManager.java:2138)
at weblogic.ejb.container.manager.BaseEntityManager.executeDeleteStmt(BaseEntityManager.java:1557)
at weblogic.ejb.container.internal.TxManager$TxListener.executeDelete(TxManager.java:848)
at weblogic.ejb.container.internal.TxManager$TxListener.executeDBOperations(TxManager.java:837)
at weblogic.ejb.container.internal.TxManager$TxListener.flushModifiedKeys(TxManager.java:1131)
at weblogic.ejb.container.internal.TxManager.flushModifiedBeans(TxManager.java:510)
at weblogic.ejb.container.internal.TxManager.flushModifiedBeans(TxManager.java:440)
at weblogic.ejb.container.manager.BaseEntityManager.flushModifiedBeans(BaseEntityManager.java:3296)
at weblogic.ejb.container.cmp.rdbms.RDBMSPersistenceManager.flushModifiedBeans(RDBMSPersistenceManager.java:4869)
at com.xxxxxxxxx.job.internal.ejb.configuration.ConfigurationAttributeEJB_dasobk__WebLogic_CMP_RDBMS.ejbFindByReferenceId(ConfigurationAttributeEJB_dasobk__WebLogic_CMP_RDBMS.java:704)
at sun.reflect.GeneratedMethodAccessor431.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at weblogic.ejb.container.cmp.rdbms.RDBMSPersistenceManager.collectionFinder(RDBMSPersistenceManager.java:507)
at weblogic.ejb.container.manager.BaseEntityManager.collectionFinder(BaseEntityManager.java:2612)
at weblogic.ejb.container.manager.BaseEntityManager.collectionFinder(BaseEntityManager.java:2588)
at weblogic.ejb.container.internal.EntityEJBLocalHome.finder(EntityEJBLocalHome.java:1122)
at com.xxxxxxxxx.job.internal.ejb.configuration.ConfigurationAttributeEJB_dasobk_LocalHomeImpl.findByReferenceId(ConfigurationAttributeEJB_dasobk_LocalHomeImpl.java:124)
at com.xxxxxxxxx.job.internal.configuration.SimpleJobItemConfigurationStore.loadConfiguration(SimpleJobItemConfigurationStore.java:93)

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