The most important practice for unit testing J2EE applications is to put all the logic you want to test into POJOs, so that the need for a J2EE specific testing tool is minimized.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus