IncompatibleClassChangeError using Java 6 Beta

[Dietmar Abts <ab...@hs-niederrhein.de>]

Hello,

testing Apache XML-RPC 3.0rc1 and Java 1.6.0-beta the exception 
"IncompatibleClassChangeError" was thrown.
Using Java 1.5 the program runs well.

import java.net.*;
import org.apache.xmlrpc.client.*;

public class EchoClient {
  public static void main(String args[]) throws Exception {
    URL url = new URL(args[0]);
    XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();
    config.setServerURL(url);
    XmlRpcClient client = new XmlRpcClient();
    client.setConfig(config);

    Object[] params = {"Hallo"};
    String s = (String) client.execute("echo.getEcho", params);
    System.out.println(s);

    String t = (String) client.execute("echo.getEchoWithDate", params);
    System.out.println(t);
  }
}

java -cp build;%XMLRPC_LIB% EchoClient http://localhost:50000

Exception in thread "main" java.lang.IncompatibleClassChangeError: 
Implementing class
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at EchoClient.main(Unknown Source)

Java SE 6 should be upwards binary-compatible with J2SE 5.0 except for 
only a few incompatibilities.

With kind regards
Dietmar Abts



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Re: IncompatibleClassChangeError using Java 6 Beta

[Jochen Wiedmann <jo...@gmail.com>]

Dietmar Abts wrote:

> testing Apache XML-RPC 3.0rc1 and Java 1.6.0-beta the exception 
> "IncompatibleClassChangeError" was thrown.
> Using Java 1.5 the program runs well.

Dietmar, I am sorry, but your description isn't sufficient for 
reproducing a problem.

I am using 1.6 myself and never had such problems. It is most possibly a 
problem with your local setup, for example different classes floating 
around or something like that. If not, I need a more concise description 
like "compile this class with JDK x and the following command ..."


Jochen

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