异常信息如下：
java.rmi.ServerException: JAXRPC.TIE.04: Internal Server Error (JAXRPC.TIE.01: caught exception while handling request: java.lang.NullPointerException)
        at com.sun.xml.rpc.client.StreamingSender._raiseFault(StreamingSender.java:372)
        at com.sun.xml.rpc.client.StreamingSender._send(StreamingSender.java:224)
        at com.sun.xml.rpc.client.dii.CallInvokerImpl.doInvoke(CallInvokerImpl.java:61)
        at com.sun.xml.rpc.client.dii.BasicCall.invoke(BasicCall.java:353)
        at client.MonitorClient.main(MonitorClient.java:58)

请指教
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