[android-developers] NoClassDefFound Exception, when using imported jar from libs folder

I am trying referencing a libs folder in my project.

1.) I created a simple jar with one single dummy class ImportableDummy.java and exported the project as a jar.

Jar Project:

2.) Then I put the jar into the libs folder inside my Project. The lib is then listed under "Private Libraries":

Jar referencing Project:

 

3.) At least I doublechecked, that the "PrivateLibraries" are marked as "exported"

QUESTION:

Still there is a java.lang.NoClassDefFoundError: com.test.my.ImportableDummy exception, when I run the App. During compileTime the class is perfectly found by the compiler.

What am I missing?

• P.S. A tried to create a separate lib project for the jar too, with the same result.
• P.P.S. I started Eclipse with the -clean argument with no result

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