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

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java.lang.NullPointerException:
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.internal.EventsManager.notifyContextDestroyedEvent(EventsManager.java:200)
at weblogic.servlet.internal.WebAppServletContext.destroy(WebAppServletContext.java:3224)
at weblogic.servlet.internal.ServletContextManager.destroyContext(ServletContextManager.java:247)
at weblogic.servlet.internal.HttpServer.unloadWebApp(HttpServer.java:461)
at weblogic.servlet.internal.WebAppModule.destroyContexts(WebAppModule.java:1535)
at weblogic.application.internal.flow.ModuleStateDriver$2.previous(ModuleStateDriver.java:387)
at weblogic.application.utils.StateMachineDriver.previousState(StateMachineDriver.java:223)
at weblogic.application.utils.StateMachineDriver.previousState(StateMachineDriver.java:215)
at weblogic.application.internal.flow.ModuleStateDriver.deactivate(ModuleStateDriver.java:141)
at weblogic.application.internal.flow.ScopedModuleDriver.deactivate(ScopedModuleDriver.java:206)
at weblogic.application.internal.flow.ModuleListenerInvoker.deactivate(ModuleListenerInvoker.java:261)
at weblogic.application.internal.flow.DeploymentCallbackFlow$2.previous(DeploymentCallbackFlow.java:547)
at weblogic.application.utils.StateMachineDriver.previousState(StateMachineDriver.java:223)
at weblogic.application.utils.StateMachineDriver.previousState(StateMachineDriver.java:215)
at weblogic.application.internal.flow.DeploymentCallbackFlow.deactivate(DeploymentCallbackFlow.java:192)
at weblogic.application.internal.flow.DeploymentCallbackFlow.deactivate(DeploymentCallbackFlow.java:184)
at weblogic.application.internal.BaseDeployment$2.previous(BaseDeployment.java:642)
at weblogic.application.utils.StateMachineDriver.previousState(StateMachineDriver.java:223)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:63)
at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:205)
at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:58)
at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:161)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:79)
at weblogic.deploy.internal.targetserver.BasicDeployment.activate(BasicDeployment.java:184)
at weblogic.deploy.internal.targetserver.BasicDeployment.activateFromServerLifecycle(BasicDeployment.java:361)
at weblogic.management.deploy.internal.DeploymentAdapter$1.doActivate(DeploymentAdapter.java:51)
at weblogic.management.deploy.internal.DeploymentAdapter.activate(DeploymentAdapter.java:200)
at weblogic.management.deploy.internal.AppTransition$2.transitionApp(AppTransition.java:30)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:240)
at weblogic.management.deploy.internal.ConfiguredDeployments.activate(ConfiguredDeployments.java:169)
at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:123)
at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:180)
at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:96)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)

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