Sounds like you're using two different sets of of jar files for compilation and runtime, respectively. My usual advice would be to forget about Maven and make sure you can compile and run the code using a simpler build method (Ant file, or even without any build tool).
I yam what I yam and that's all that I yam - the great philosopher Popeye. Tiny ad:
RavenDB is an Open Source NoSQL Database that’s fully transactional (ACID) across your database