This is what I get:

```
[user@localhost KioskMenu]$ java -jar ./kioskmenu.jar 
Exception in thread "main" java.lang.ClassFormatError: KioskMenu (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)
[user@localhost KioskMenu]$ 

```

The only thing I noticed was that my RHEL is using a "free" version of Java. But this shouldn't matter should it?