title: ClassNotFound exception after adding external jar
body: <p>I'm adding an external <code>jar</code> to my <code>Eclipse</code> project. After running the programs which contain classes from <code>external jar</code> I'm getting a <code>ClassNotFound</code> exception for the classes from <code>external jar</code>. I have tried to change the export order and tried including it in run configurations. Still the error exists. Any ideas?</p>