I presently use Jboss 4.2x  version.Now i plan to move any one of next versions.I went so many  from, but i didn't get clarity which version more use full for my production.

my application consists of following

1. JDK 1.6

2.JBoss 4.2.1

3.Struts 2.1

4.Spring 2.5

5.POI

6.JQuery 1.2

is any one  send advantages and difficulties while migration.