How to export a Java Project to a executable jar in Eclipse?

Hello!

I have a small program that I exported into a jar in eclipse. Eclipse created the META-INF and the manifest.mf file as well.

But I did not got the cjhance to add this line i my manifest.mf:
Main-Class: myproject.MyClass

Is there a way to configure Eclipse letting me do this so the jar gets executable right a way?

Now I need to extract the manifets file and add it to the jar afterwards outside Eclipse.

Btw I use Eclipse Classic 3.3.1.1 in Linux.

Best regards
Fredrik