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From "Bellekens, P.A.E." <P.A.E.Bellek...@TUE.nl>
Subject RPC connection problem
Date Tue, 18 Jul 2006 09:25:00 GMT
Dear all, 

 

I have some problem getting XML-RPC 3.0b1 to work.

The last years I was always working with version 1 and later on version
2, but now I was somewhat attracted by the nice new features of version
3.

I tried to set up a very simple client server from which you can see the
code here:

 

Server:

#########################################################

 

static int port = 3099;

            private WebServer server;

            

            public static void main(String[] args) {

                        new Start();

            }

            

            public Start(){

                        try {

                                    server = new WebServer(port);

                                    XmlRpcServerConfigImpl config = new
XmlRpcServerConfigImpl();

 
config.setEnabledForExtensions(true);

 
config.setContentLengthOptional(true);

 
server.getXmlRpcServer().setConfig(config);

                                    server.start();

                                    

                                    System.out.println("RPC server
running.");

                        } 

                        catch (Exception e) {

                                    e.printStackTrace();

                        }

            }

            

            public int loginUser(String userId ) {

                        return 0;

             }

 

#########################################################

 

Client:

#########################################################

 

    static XmlRpcClient xmlrpc;

    

    public static void main( String args[] ) {

        try {            

            Vector params = new Vector ();

            params.addElement( "user1" );

            

            XmlRpcClientConfigImpl config = new
XmlRpcClientConfigImpl();

            config.setServerURL(new URL("http://localhost:3099/"));

            config.setEnabledForExtensions(true);

            config.setContentLengthOptional(true);

            xmlrpc = new XmlRpcClient();

            xmlrpc.setConfig(config);

 

            Integer r = (Integer) xmlrpc.execute ("loginUser", params);

        } catch (Exception e) {

            e.printStackTrace( System.out );

        }

    }

 

#########################################################

 

If I now start the server and fire the client I get the following
exceptions:

 

Server:

#########################################################

 

18-jul-2006 11:19:52 org.apache.xmlrpc.server.XmlRpcStreamServer execute

SEVERE: execute: Error while performing request

java.lang.NullPointerException

      at
org.apache.xmlrpc.server.XmlRpcServerWorker.execute(XmlRpcServerWorker.j
ava:42)

      at
org.apache.xmlrpc.server.XmlRpcServer.execute(XmlRpcServer.java:79)

      at
org.apache.xmlrpc.server.XmlRpcStreamServer.execute(XmlRpcStreamServer.j
ava:182)

      at org.apache.xmlrpc.webserver.Connection.run(Connection.java:175)

      at
org.apache.xmlrpc.util.ThreadPool$MyThread.runTask(ThreadPool.java:71)

      at
org.apache.xmlrpc.util.ThreadPool$MyThread.run(ThreadPool.java:87)

 

#########################################################

 

Client:

#########################################################

 

org.apache.xmlrpc.client.XmlRpcClientException: Failed to parse servers
response: The XML declaration may only appear at the very beginning of
the document.

      at
org.apache.xmlrpc.client.XmlRpcStreamTransport.readResponse(XmlRpcStream
Transport.java:174)

      at
org.apache.xmlrpc.client.XmlRpcStreamTransport.sendRequest(XmlRpcStreamT
ransport.java:149)

      at
org.apache.xmlrpc.client.XmlRpcHttpTransport.sendRequest(XmlRpcHttpTrans
port.java:95)

      at
org.apache.xmlrpc.client.XmlRpcSunHttpTransport.sendRequest(XmlRpcSunHtt
pTransport.java:39)

      at
org.apache.xmlrpc.client.XmlRpcClientWorker.execute(XmlRpcClientWorker.j
ava:53)

      at
org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:166)

      at
org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:157)

      at
org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:146)

      at
nl.tue.bluis.client.application.userDetectionClient.XmlRpcTest.main(XmlR
pcTest.java:42)

Caused by:

org.xml.sax.SAXParseException: The XML declaration may only appear at
the very beginning of the document.

      at
org.apache.xerces.framework.XMLParser.reportError(XMLParser.java:1213)

      at
org.apache.xerces.framework.XMLDocumentScanner.reportFatalXMLError(XMLDo
cumentScanner.java:570)

      at
org.apache.xerces.framework.XMLDocumentScanner.abortMarkup(XMLDocumentSc
anner.java:624)

      at
org.apache.xerces.framework.XMLDocumentScanner$PrologDispatcher.dispatch
(XMLDocumentScanner.java:810)

      at
org.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentScan
ner.java:381)

      at
org.apache.xerces.framework.XMLParser.parse(XMLParser.java:1098)

      at
org.apache.xmlrpc.client.XmlRpcStreamTransport.readResponse(XmlRpcStream
Transport.java:172)

      at
org.apache.xmlrpc.client.XmlRpcStreamTransport.sendRequest(XmlRpcStreamT
ransport.java:149)

      at
org.apache.xmlrpc.client.XmlRpcHttpTransport.sendRequest(XmlRpcHttpTrans
port.java:95)

      at
org.apache.xmlrpc.client.XmlRpcSunHttpTransport.sendRequest(XmlRpcSunHtt
pTransport.java:39)

      at
org.apache.xmlrpc.client.XmlRpcClientWorker.execute(XmlRpcClientWorker.j
ava:53)

      at
org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:166)

      at
org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:157)

      at
org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:146)

      at
nl.tue.bluis.client.application.userDetectionClient.XmlRpcTest.main(XmlR
pcTest.java:42)

 

#########################################################

 

 

I don't really get why I get these exceptions.

Online I couldn't really find any link which explains a similar problem,
or describes the same setting.

I hope anybody here can give me some pointers about what goes wrong.

 

With kind regards,

Pieter

 

 

 


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