Re: classFormatException error in hello world example?

From:

"Oliver Wong" <owong@castortech.com>

Newsgroups:

comp.lang.java.help

Date:

Fri, 9 Feb 2007 10:55:54 -0500

Message-ID:

<xQ0zh.32987$tt1.203309@wagner.videotron.net>

"BenTaylor" <ben.j.taylor.1@hotmail.co.uk> wrote in message
news:1171036238.575033.167320@p10g2000cwp.googlegroups.com...

i'm trying to run the very simple example at
[url]http://java.sun.com/docs/books/tutorial/getStarted/cupojava/
unix.html[/url]
having installed the jdk for linux from java.sun.com's downloads
section,
and I've done it exactly as described but it gives me this error:

[ben@benlinux helloworld]$ java HelloWorldApp
Exception in thread "main" java.lang.ClassFormatError: HelloWorldApp
(unrecognized class file version)
  at java.lang.VMClassLoader.defineClass(libgcj.so.7rh)
  at java.lang.ClassLoader.defineClass(libgcj.so.7rh)
  at java.security.SecureClassLoader.defineClass(libgcj.so.7rh)
  at java.net.URLClassLoader.findClass(libgcj.so.7rh)
  at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.7rh)
  at java.lang.ClassLoader.loadClass(libgcj.so.7rh)
  at java.lang.ClassLoader.loadClass(libgcj.so.7rh)
  at gnu.java.lang.MainThread.run(libgcj.so.7rh)

any ideas what could be the problem?

    It's basically saying that the java interpreter is unable to read the
compiled program. This may be because your compiler targets a different
version of Java than your interpreter, or because some mistake occurred
while compiling leading to a corrupt file.

    How did you compile the Java program?

    - Oliver