RPC connection problem

Bellekens, P.A.E. Tue, 18 Jul 2006 02:25:26 -0700

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.java:42)

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

at org.apache.xmlrpc.server.XmlRpcStreamServer.execute(XmlRpcStreamServer.java: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(XmlRpcStreamTransport.java:174)

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

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

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

at org.apache.xmlrpc.client.XmlRpcClientWorker.execute(XmlRpcClientWorker.java: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(XmlRpcTest.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(XMLDocumentScanner.java:570)

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

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

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

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

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