Could you please clarify: do you want to run your project or a project from an independent jar?
In the first case just select Run Project from the project context menu or select a class with main method and click Run File in the class context menu.
Regarding the second case:
- I don't think there is such a feature in the IDE (running third party jars is not an IDE function). Could you explain why you need this?
You cannot run a jar file from within the IDE. Why would you need such functionality?
However if you just want to make the jar file runnable, add the Main-Class entry to its manifest. It should point to the class containing a main method. It will be called when a jar file is executed.