java.lang.Exception: java.lang.NullPointerException

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java.lang.Exception: java.lang.NullPointerException
at oracle.mds.internal.persistence.NamespaceRulesImpl.(NamespaceRulesImpl.java:123)
at oracle.mds.internal.persistence.NamespaceRules.getNamespaceRulesObj(NamespaceRules.java:72)
at oracle.mds.internal.util.ChangeUtil.convertToMOEvents(ChangeUtil.java:134)
at oracle.mds.internal.notifications.EventNotificationManager.handleChanges(EventNotificationManager.java:490)
at oracle.mds.internal.notifications.EventNotificationManager.handlePChanges(EventNotificationManager.java:291)
at oracle.mds.core.MOState.signalStale(MOState.java:1185)
at oracle.mds.core.MOState.signalStale(MOState.java:644)
at oracle.mds.core.MOState.checkStalenessDocFromBuilder(MOState.java:739)
at oracle.mds.core.MOState.getIsStaleLastModified(MOState.java:559)
at oracle.mds.core.MOContent.getIsStaleLastModified(MOContent.java:277)
at oracle.mds.core.ChainedMOContent.getIsStaleLastModified(ChainedMOContent.java:142)
at oracle.mds.core.MetadataObject.isStale(MetadataObject.java:823)
at oracle.adf.share.jndi.MDSBackingStore.obtainMetadataObject(MDSBackingStore.java:517)
at oracle.adf.share.jndi.MDSBackingStore.getMOBean(MDSBackingStore.java:572)
at oracle.adf.mbean.share.config.RuntimeMXBeanImpl.init(RuntimeMXBeanImpl.java:192)
at oracle.adf.mbean.share.config.RuntimeMXBeanImpl.(RuntimeMXBeanImpl.java:182)
at oracle.adf.mbean.share.config.RuntimeMXBeanImpl.(RuntimeMXBeanImpl.java:173)
at oracle.adf.mbean.share.config.RuntimeMXBeanImpl.(RuntimeMXBeanImpl.java:165)
at oracle.adf.mbean.share.config.ADFConfigLifeCycleCallBack.contextInitialized(ADFConfigLifeCycleCallBack.java:130)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.internal.EventsManager.notifyContextCreatedEvent(EventsManager.java:181)
at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1868)
at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:3154)
at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1518)
at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:425)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52)
at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:119)
at weblogic.application.internal.flow.ScopedModuleDriver.start(ScopedModuleDriver.java:200)
at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:247)
at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:425)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52)
at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:119)

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