by ignotus » Wed Dec 31, 2014 9:48 am
You're not supposed to extract it. I'm going to assume you're using Ubuntu, Mint or similar. First, make sure you have Java installed (check with your distro's package manager if not sure). Right click on the .jar file > properties > Permissions tab. Here, activate "Allow executing file as program" > close. Now, right click again on the .jar file and if you do not see the option "Open with OpenJDK Java 7 Runtime" or similar at the top, go again to Properties > 'Open With' tab. Here, choose "OpenJDK Java 7 Runtime". Now, you can double click on the file and it should open.
If it ain't broken... fix it until it is.