How to create a .app folder from an executable .jar?
If you want an easy way without need of third-party apps:


Launch AppleScript editor
Write the following:

--do shell script "java -jar /Contents/execute.jar"


I commented that line out because we have yet to put the jar there. Save as application. Now Right click on produces .app file -> Show Package Contents, go to Contents and drag the .jar file there. Now go to Resources -> Scripts -> main.scpt and open that. Now remove the double dash (--), compile and save.

If it doesn't launch, try executing in terminal chmod 777 &lt;path to jar file&gt; simply drag the jar into Terminal.