java.lang.NullPointerException with Async

[Eric BOYER]

Hello,

i have a java.lang.NullPointerException and I don't know why :
java.lang.NullPointerException
   at 
org.apache.xmlrpc.XmlRpcClient$XmlRpcClientAsyncThread.run(XmlRpcClient.java:271)


Have you got an idea ?

My code is :
       XmlRpcClient client = new 
XmlRpcClient("http://footcrix:10500/RPC2";);

       Vector params = new Vector();
       params.addElement(new Integer(5000));
      
       XmlRpc.setDebug(true);
       try {
          
           client.executeAsync("bonjour.disBonjour", params, new 
EcouteurAsynchrone());
          
       }
       catch (Exception ex) {
           System.err.println("Error: " + ex.getMessage());
       }

--------------------- EcouteurAsynchrone.java --------------
public class EcouteurAsynchrone implements AsyncCallback{
  

       /*
        * @see 
org.apache.xmlrpc.AsyncCallback#handleResult(java.lang.Object, 
java.net.URL, java.lang.String)
        */
       public void handleResult(Object result, URL url, String method) {
           System.out.println("resultat :");
           System.out.println(result);

       }

       /*
        * @see 
org.apache.xmlrpc.AsyncCallback#handleError(java.lang.Exception, 
java.net.URL, java.lang.String)
        */
       public void handleError(Exception exception, URL url, String 
method) {
           System.out.println("erreur :");
           exception.printStackTrace();
       }

  
}
------------------------------------
Thanks,
Eric