JBoss somehow IS another JavaEE SDK, as the Sun J2EE SDK is nothing more than a bundle of IDE, AppServer, and some tools.
So pick e.g. JBossIDE and JBoss and you have another flavor of a JavaEE SDK.
JavaEE is just a standard, so you need an appserver which is compatible to this standard, and an IDE supporting it.
Hope this makes it a bit clearer
In addition to Wolfgang's post the JBoss AS is nothing more than an implementation of the J2EE API. The JavaDoc of it can be downloaded at Sun's website.
The JAR's in question (i.e. jboss-j2ee.jar) are in <JBOSS_HOME>/server//lib.
Guys, thanx a lot !!!!, I had a Misconception !!!!!, Light Now Shines !!!!
Thanx for fast response
It is an implementation of the Java EE standard; and a lot more ;-)