Can you only run one main() in a jar?

Hi,
I was just wondering if you can only ever run one main() method from a .jar file? I have a project being developed in Eclipse, consisting of several packages and then several classes with main()s in each of the packages. When the whole project is packaged into one big jar then I can run one of the main() methods by specifying it in the manifest, but as far as I'm aware I can't access the others.
Is there some cunning way to call the main() method of a different class to that specified in the jar manifest, or do I have to compile every class as a separate jar? And if that's the case, is there really any advantage to putting the classes into a jar as opposed to just running from the .class files?
Any help much appreciated. :)
h

Wow, thanks for the quick responses guys!
You can execute the other main methods byexecuting:
java -cp the-class-path TheMainClassIsn't that just what I'd use from the compiled .class
files though?Correct, but you specify the jar on your classpath. e.g.
java -cp myjar.jar TheMainClasss1 or
java -cp myjar.jar TheMainClasss2
For example:
java -cp the-class-path my.class1
java -cp the-class-path my.class2
How does this relate to a single .jar file containing
both of those classes? See above
If I try those commands in the
directory containing the .jar file, I just get a
NoClassDefFoundError (they work fine in the directory
with the .class files though).That's because you didn't specify the classpath in the correct way.
Kaj

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