Re: classFormatException error in hello world example?

"Oliver Wong" <>
Fri, 9 Feb 2007 10:55:54 -0500
"BenTaylor" <> wrote in message

i'm trying to run the very simple example at
having installed the jdk for linux from's downloads
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(
  at java.lang.ClassLoader.defineClass(
  at gnu.gcj.runtime.SystemClassLoader.findClass(
  at java.lang.ClassLoader.loadClass(
  at java.lang.ClassLoader.loadClass(

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

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