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Doesn't work can mean many things. Please define in detail what you mean by 'doesn't work'.

By 'doesn't work' I presume it doesn't launch. Go to the command line and try running the jar from there



java -jar nameofjar.jar


I suggest this because using the command line you can...

In Eclipse, right click the project and go to Export. Go to Java->Runnable Jar (if you want a runnable jar). In the following window, choose your class containing the main method you wish to launch...