I am not sure what are trying to achieve, could you please elaborate more on that? It will be easier to point you in right direction if I know what is your goal.
The jars produced by BRMS are not executable jars (they don't have main class, unless you created one there). They are Knowledge Jars (kjars) considered as an deployment unit. You need to deploy that unit into the Drools runtime and then you can fire rules/insert facts/etc. Take a look at the examples in docs: Chapter 19. Examples