I don't really understand what you are saying. If your saying you think there is a bug, please give us more info, type of test, topology, versions etc etc
First of all I would like to know(if possible) which is the correct scenario ?
If I stop JBoss and have in-process messages, should processing resume on JBoss restart ?
well that depends on what your scenario is, you havent told me enough info. persistant, is client side buffering enabledm how are you killing thenode etc etc