Adding APIs to Jlink app

Hi,

I'm trying to build a Creo Jlink app in Java and I'm using external APIs. The code works and it prints the stuff I want to eclipse's console. But when I launch it from Creo it does nothing (if I start it without the code from the API it works okay).

I'm not a very experienced programmer but I assume I need to somehow reference the libraries to Creo so my code works.

Thanks in advanced.