Best/most popular/your favorite 2d java game engine?

Newbie & Debugging Questions
#1

What are some good suggestions of the ones used by most people? \

thanks!

#2

http://slick.cokeandcode.com/ is getting a lot of attention these days.

Other alternatives could be:
http://www.stencyl.com/
http://www.goldenstudios.or.id/products/GTGE/

#3

There’s a few more (list taken from the slick website, removing the ones already mentioned) :

GAGE
EasyWay
SPGL
JASEL
JGame
PulpCode

Kev