Eclipse 3.4 (Gallileo) – NoClassDefFoundError

I recently updated my Eclipse from a beta of 3.4 to the latest Gallileo version using Yoxos OnDemand service.

After that I received always the following error, if I started a application or unit test case from eclipse:

Exception in thread "main" java.lang.NoClassDefFoundError: info/javahelp/TestClass

The solution for me was to reset the used JRE in the Build Path (Project Properties -> Java Build Path).

Project properties

Here I changed from a System JRE from the underlying operation system Mac OS X to the used JRE Eclipse in running in.

Edit Library

After that a normal start of the application or test case was possible.