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java.lang.NullPointerException: 	at com.sun.enterprise.util.InvocationManagerImpl.preInvoke(InvocationManagerImpl.java:136)	at com.sun.appserv.server.ServerLifecycleModule.preInvoke(ServerLifecycleModule.java:178)	at com.sun.appserv.server.ServerLifecycleModule.postEvent(ServerLifecycleModule.java:219)	at com.sun.appserv.server.ServerLifecycleModule.onShutdown(ServerLifecycleModule.java:273)	at com.sun.appserv.server.LifecycleModuleService.onShutdown(LifecycleModuleService.java:487)	at com.sun.enterprise.server.ApplicationServer.onShutdown(ApplicationServer.java:549)	at com.sun.enterprise.server.ondemand.OnDemandServer.onShutdown(OnDemandServer.java:131)	at com.sun.enterprise.server.PEMain.run(PEMain.java:429)	at com.sun.enterprise.server.PEMain.main(PEMain.java:338)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at com.sun.enterprise.server.PELaunch.main(PELaunch.java:412)