Question

When i compile and run my program in eclipse, it works.
When i run my .jar program on my personal computer (Windows 8 with java JDK 7), it works.
But when i’m trying to run .jar in others computers, it doesn’t work.

So i tried to run with command line java -jar myjar
and i got this message which i can’t understand

java -jar "Bureau\Application SNCF\SNCF.jar"

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file

    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)

Does anyone understand this message error?
Thanks for your help

Answer 1

This is always caused by the conflict of different Java JDK at compile time and runtime, make sure you are using same JDK version to compile and run it.