ClassNotFoundException

[Silent]

I try to make my first app based on this: Introduction to Developing Web Applications - NetBeans IDE Tutorial

When I run the app I get an ClassNotFoundException. This means, the app builds fine. I can start it and the page is displayed. Only the moment I push the button and another class should be called the exception is created.

I'm pretty sure the problem is with the packages. The manual says: "2.Right-click the Source Packages node and choose New > Java Class. Enter NameHandler in the Class Name text box and type org.mypackage.hello in the Package combo box."

However I don't see a Package combo box. So I ignored this step. Consequently where the example source code contains a package statement mine does not and when I try to add one I'm not sure what package name to use. Some names that I came up with are not accepted, others are accepted, but the error remains.

Can someone please point out where I go wrong and how to fix this or where to find a solution?

[quad64bit]

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