从另一个 Web 服务调用 Web 服务时出现 Axis2 错误

Question

我有一个名为 DownloadServer 的 Axis2 Web 服务，它正在调用另一个名为 Publisher 的 Axis2 Web 服务。它们部署在同一台服务器上。这是两个 Web 服务的代码。

在 Publisher.java 类中：

public String getFileServers(){
    return "http://localhost:8080/axis2/services/FileServer1?wsdl http://localhost:8080/axis2/services/FileServer2?wsdl";
}

在类 DownloadServer.java：

public synchronized String getBandwidth(String title) {
        try {
            // Call Publisher service to get addresses of File Servers
            RPCServiceClient serviceClient = new RPCServiceClient();
            Options options = serviceClient.getOptions();
            EndpointReference targetEPR = new EndpointReference(
                    "http://localhost:8080/axis2/services/Publisher?wsdl");
            options.setProperty(HTTPConstants.AUTO_RELEASE_CONNECTION,
                    org.apache.axis2.Constants.VALUE_TRUE);
            options.setTo(targetEPR);
            QName methodName = new QName("http://ws.apache.org/axis2",
                    "getFileServers");
            Class[] returnTypes = new Class[] { String.class };
            Object[] args = new Object[] {};
            // Exception occurs on the next line
            Object[] response = serviceClient.invokeBlocking(methodName, args,
                    returnTypes);
            serviceClient.cleanupTransport();
            String fileServers = (String) response[0];

            return fileServers
        } catch (Exception e) {
            e.printStackTrace(out);
            return "0";
        }
    }

我收到以下 Axis2 故障：

org.apache.axis2.AxisFault: The server did not recognise the action which it received: 
    at org.apache.axis2.handlers.addressing.AddressingInFaultHandler.invoke(AddressingInFaultHandler.java:114)
    at org.apache.axis2.engine.Phase.invoke(Phase.java:318)
    at org.apache.axis2.engine.AxisEngine.invoke(AxisEngine.java:254)
    at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:160)
    at org.apache.axis2.description.OutInAxisOperationClient.handleResponse(OutInAxisOperation.java:364)
    at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:417)
    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:540)
    at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:521)
    at org.apache.axis2.rpc.client.RPCServiceClient.invokeBlocking(RPCServiceClient.java:102)
    at DownloadServer.getBandwidth(DownloadServer.java:56)
    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:597)
    at org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:194)
    at org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:102)
    at org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
    at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:114)
    at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:173)
    at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:173)
    at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:144)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    at 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:662)

有趣的是，当我将 DownloadServer 类作为常规 Java 应用程序（不作为 Web 服务调用）运行时，我没有遇到同样的异常。

有没有人知道当相同的代码作为网络服务执行时会出现什么问题？

Answer 1

好的，我终于找到了答案。看起来像显式设置 SOAP 操作可以解决问题。可以这样做：

options.setAction("urn:getFileServers");