NoClassDefFoundError, why?

Question

Hello Javas,
My application is reporting the NoClassDefFoundError and I'd like to know how to solve this problem.
The scenario is: Application creates an object define in a class stored in "modulo.zip". The object's constructor creates another object based on a constructor's parameter value. This new object is define in another class stored in "modulo_x.zip". The NoClassDefFoundError occurs when the class defined in modulo_zip creates the object defined and stored in modulo_x.zip. So in runtime my application.jar can look for object's definitions in anywhere listed in -cp but what about one library looking for a definition in another which is stored in the same working directory?
How can I design this situation to work out.
Compilation has no problem because the objects all implement the same interface.
Any help?

Answer 1

Make sure there exists a .class file for that other class in modulo_x.zip. You have both the zip files in your classpath, right? While specifying the classpath, you need to give the entire path upto the zip file and not just upto the directory containing the zip file. So, you need to specify these two zip files explicitly in your classpath. Specifying just the directory containing these is not sufficient.