Exception in thread "main" java.lang.ClassFormatError: onmyown.Main (unrecognized cla

So I'm trying to run a program I made in java netbeans....I am using fc7 it builds ok but when I try to run it in terminal I get errors this is what happened

java -jar "/home/zimboney/onMyOwn/dist/onMyOwn.jar"

Exception in thread "main" java.lang.ClassFormatError: onmyown.Main (unrecognized class file version)
at java.lang.VMClassLoader.defineClass(libgcj.so.8rh)
at java.lang.ClassLoader.defineClass(libgcj.so.8rh)
at java.security.SecureClassLoader.defineClass(libgcj.so.8rh)
at java.net.URLClassLoader.findClass(libgcj.so.8rh)
at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.8rh)
at java.lang.ClassLoader.loadClass(libgcj.so.8rh)
at java.lang.ClassLoader.loadClass(libgcj.so.8rh)
at gnu.java.lang.MainThread.run(libgcj.so.8rh)

I was looking over the internet for a solution and someone said to change the default version I currently have 1.6 installed but my java --version says I have 1.5 maybe that is the problem can someone tell me how to change that

Not sure if this will help you, but my Java problems in Fedora usually are fixed after following this howto...

http://www.gagme.com/greg/linux/f7-tips.php#java

/Roger

The differences between jdk5 and jdk6 tend to be minimal even though some frameworks (spring for example) will fail to install with jdk6 installed. I think it far more likely that you are simply facing a programming error. From the looks of it, the compiler can't find the class to load: wrong name, wrong extension, ...?

thanks for your help nordickiwi after looking at that I did what it told me to do then I uninstalled java and installed it again then it started working for me

Pleased to help.

/Roger