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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)