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Date: Wed, 12 Sep 2012 10:19:07 -0700 (PDT)
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Subject: Re: How Do I Publish My Working Project (corresponding dot jar doesn't work on other's PCs)
From: Lew <lewbloch@gmail.com>
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Xref: csiph.com comp.lang.java.programmer:18680

(unknown) wrote:
> System.out.println("Hello 1");
> 
> I then ran the project on my friend's PC using the Command Prompt and the command: java testing.jar

This command tells Java to run a 'main()' method from the class 'testing.jar', 
which would reside in a class file relative to a classpath element "testing/jar.class".

This class does not exist. Therefore

> I received the error message:
> 
> Exception in thread "main" java.lang.NoClassDefFoundError: testing/jar

Exactly so.

> Caused by: java.lang.ClassNotFoundException: testing.jar
> ...
> Could not find the main class: testing.jar.  Program will exit.

Solution:
Don't tell Java to run a nonexistent class.

You need to read the tutorial markspace linked:
> Classpath in a jarfile: 
> 
> <http://docs.oracle.com/javase/tutorial/deployment/jar/downman.html> 

Pay attention.

-- 
Lew