Never refer to the same JAR using Class-Path from two different modules. (It will get loaded twice and could cause strange problems.) If you think you need to, generally this just means you have not factored out your module dependencies thoroughly: split off a third module to hold the library.
R. Angles, and C. Gutierrez. The Semantic Web: Research and Applications, volume 3532 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2005)