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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:399)	at sun.rmi.registry.RegistryImpl.rebind(RegistryImpl.java:153)	at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)	at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:386)	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:250)	at sun.rmi.transport.Transport$1.run(Transport.java:159)	at java.security.AccessController.doPrivileged(Native Method)	at sun.rmi.transport.Transport.serviceCall(Transport.java:155)	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:619)	at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)	at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:359)	at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)	at java.rmi.Naming.rebind(Naming.java:160)	at com.pack.rmi.RemoteServer.(RemoteServer.java:16)	at com.pack.rmi.RemoteServer.main(RemoteServer.java:28)