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

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java.lang.NullPointerException:
at javax.servlet.GenericServlet.getServletName(GenericServlet.java:322)
at javax.servlet.GenericServlet.log(GenericServlet.java:277)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doGetSerializationPolicy(RemoteServiceServlet.java:219)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.prepareToRead(ServerSerializationStreamReader.java:429)

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