java 调用webService 接口出现org.apache.axis2.AxisFault: java.lang.NullPointerException

org.apache.axis2.AxisFault: java.lang.NullPointerException
at org.apache.axis2.util.Utils.getInboundFaultFromMessageContext(Utils.java:531)
at org.apache.axis2.description.OutInAxisOperationClient.handleResponse(OutInAxisOperation.java:375)
at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:421)
at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:555)
at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:531)
at util.WebServiceUtil.invokeWebService(WebServiceUtil.java:49)
at busi.IntreFaceImpl.doMethodByParam(IntreFaceImpl.java:317)
at action.flow.InterFaceAction.execute(InterFaceAction.java:88)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)

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