Sometime ago Eduardo spent some time to create basic maven archetypes for JSLEE. Since 2.x CR1 of JSLEE is going out and there was a lot of google group traffic regarding setting up basic project, I dedicated some time to create similar package for JSLEE 1.1.
Here is wiki page which describes how to use archetypes (iirc). I will update it once I get spare 5 minutes.
Sources can be found here.