First of all thanks all the SpringDE developers for their hard work. Thanks!
Ok, just want to remind you guys if you want to use both SpringIDE and FacesIDE, you must install SpringIDE first and then FacesIDE.
If you do it in the wrong order, SpringIDE will corrupte your FacesIDE. And re-installing FacesIDE after installing SpringIDE are not going to work.