IllegalArgumentException when invoking axis2-webservice with client

MC <>
Sat, 16 Feb 2008 19:42:57 +0100
i just wrote a webservice using the axis2-framework .. the service can
be found here:
package de.testService;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Vector;

public class TestService {

     public Connection con = null;
     TransportContainer tc = new TransportContainer();
     Vector v = new Vector();

     public final void connection() throws Exception {
         con = DriverManager.getConnection(
                 "jdbc:mysql://localhost:3306/travelagent", "root", "");

     public TransportContainer getHotels(String table) {
         try {
             String sql = "SELECT * FROM " + table;
             PreparedStatement pStmt = con.prepareStatement(sql);
             ResultSet rs = pStmt.executeQuery();
             while ( {
                 v.addElement(new Hotel(rs.getString(2), rs.getString(3), rs
                         .getString(4), rs.getString(6), rs.getInt(5)));
         } catch (Exception e) {
         return tc;



the service uses a class called TransportContainer, which contains the
data that should be send from the service to the client. this class can
be found here:

package de.testService;

import java.util.Vector;

public class TransportContainer {

     public TransportContainer() {


     public Vector v;

     public void setData(Vector data) {
         this.v = data;

     public Vector getData() {
         return this.v;

to invoke the service, i wrote a client which can be found here:

package de.wsTester;

import javax.xml.namespace.QName;

import org.apache.axis2.AxisFault;
import org.apache.axis2.addressing.EndpointReference;
import org.apache.axis2.client.Options;
import org.apache.axis2.rpc.client.RPCServiceClient;

import de.testService.*;

public class TestClient {

     public static void main(String[] args) throws AxisFault {

         RPCServiceClient sender = new RPCServiceClient();
         Options options = sender.getOptions();

         EndpointReference targetERP = new EndpointReference(

         QName opGetHotels = new QName("",

         String table = "hotels";
         Object[] opArgs = new Object[] { table };

         Class[] returnTypes = new Class[] { TransportContainer.class };
         Object[] response = sender.invokeBlocking(opGetHotels,


when i start the client, i get the following exception:

Exception in thread "main" java.lang.IllegalArgumentException: argument
type mismatch
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at de.wsTester.TestClient.main(

thx to soapmonitor, i can see that the service return the expected

<?xml version='1.0' encoding='utf-8'?>
<soapenv:Envelope xmlns:soapenv="">
     <ns:getHotelsResponse xmlns:ns="">
       <ns:return xmlns:ax21=""
         <ax21:data type="de.testService.Hotel">
           <ax21:hotelName>Axis2 Grand Hotel</ax21:hotelName>
         <ax21:data type="de.testService.Hotel">
           <ax21:hotelName>Axis2 Plaza</ax21:hotelName>
         <ax21:data type="de.testService.Hotel">

whats wrong with my code? i would be thankful for any advice or hints on
how to improve my code.


matthias :):)

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