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How to generate jar using NetBeans

Enrique Nivasch

Joined: Aug 10, 2008
Posts: 2
I am using NetBeans 6.1 to develop my software on a Vista based machine. My application is currently made up of two classes that live as two separate source files. When I click on the Run Main Project button on the IDE everything works fine. If I click on the Build Main Project button and the double click on the generated .jar file that sits in the dist folder I get a �Could not find the main class. Program will exit.� Message. How should I generate the jar file so it will run?


Jeanne Boyarsky
author & internet detective

Joined: May 26, 2003
Posts: 32628

Welcome to JavaRanch!

We have a forum dedicated to IDEs. I'll move this for you.

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Freddy Wong
Ranch Hand

Joined: Sep 11, 2006
Posts: 959

It's because there's no Main-Class field in your MANIFEST.MF. In order for NetBeans to add the Main-Class field in the MANIFEST.MF, you need to set the main class in your NetBeans project.
1. Right click on the project->Properties->Run
2. Set the main class.

Hope this helps.

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