Not Working On Linux

# java -jar libs/solDesktop.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/miloshpetrov/sol2/desktop/SolDesktop : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: com.miloshpetrov.sol2.desktop.SolDesktop. Program will exit.

# java -version
java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) Server VM (build 17.1-b03, mixed mode)

Forums: 

Upgrading to java version "1.7.0_65" fixed the problem. Game is now working! Thanks!

This game WORKS fine on Linux Mint.
You can install Steam, Look in the Linux Games Library and you will see this game. Works THROUGH steam i guess.

REMEMBER: Steam has this FreeToPlay game available NOW