Please HELP! java.lang.IncompatibleClassChangeError:Implementing class

[Ying]

Hi,   I'm a beginner of the axis. I got a simple web service deployed called MyEcho, which is just a duplicate version of samples.userguide.example3.MyService. My TestClient works fine with it.   Then I used Java2WSDL, and generated a wsdl file for MyEcho.java. Next, I convert this wsdl file to java code for both client and server side by using  WSDL2Java.  I implemented the MyEchoSoapBindingImpl.java, and deployed it(after undeployed the previous one). My TestClient also works fine with this service. :-)   However, when I tried to implement a client side tester ( followed the instruction on Axis User's Guide), I got following exception at the runtime.   % java samples.myservice.echo.MyEchoClient "test" Exception in thread "main" java.lang.IncompatibleClassChangeError: Implementing class         at java.lang.ClassLoader.defineClass0(Native Method)         at java.lang.ClassLoader.defineClass(ClassLoader.java:486)         at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)         at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)         at java.net.URLClassLoader.access$100(URLClassLoader.java:56)         at java.net.URLClassLoader$1.run(URLClassLoader.java:195)         at java.security.AccessController.doPrivileged(Native Method)         at java.net.URLClassLoader.findClass(URLClassLoader.java:188)         at java.lang.ClassLoader.loadClass(ClassLoader.java:297)         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)         at java.lang.ClassLoader.loadClass(ClassLoader.java:253)         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)         at samples.myservice.echo.MyEchoClient.main(MyEchoClient.java:13) My simple client side tester is: --------------------------------------------------- package samples.myservice.echo;   public class MyEchoClient {   public static void main(String [] args) throws Exception {          String textToSend;               if ((args == null) || (args.length < 1)) {                 textToSend = "<nothing>";             } else {                 textToSend = args[0];             }           MyEchoService myecho = new MyEchoServiceLocator();           MyEcho mystub = myecho.getMyEcho();           String ret = mystub.myEchoService(textToSend);             System.out.println("You Typed: " + ret);   }   }   Line 13 is: MyEchoService myecho = new MyEchoServiceLocator(); I used JDK1.3, axis beta 2, tomcat 4.0.3   Thanks for any help, Ying