Re: classFormatException error in hello world example?

From:

Nigel Wade <nmw@ion.le.ac.uk>

Newsgroups:

comp.lang.java.help

Date:

Fri, 09 Feb 2007 16:32:43 +0000

Message-ID:

<eqi7nc$dce$1@south.jnrs.ja.net>

BenTaylor wrote:

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?

cheers

It looks like your system has a conflict between the Sun Java installation and
an existing gcj installation.

Check exactly what executable the "java" command runs (and also javac). It might
be that you've used a recent Sun SDK javac compiler to create the classes, but
the java command is an older version of java (from gcj).

--
Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw@ion.le.ac.uk
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555