Debug JBoss source code

I would like to obtain the JBoss Applic开发者_如何转开发ation Server 5.1.0 source code to go through it on Debugging mode. Where and how can I find the sources of JBoss? (if possible).

A Jar with the sources would be nice, but it seems not to be easy to find...

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Either download the source from http://sourceforge.net/projects/jboss/files/JBoss/JBoss-5.1.0.GA/ or if you use Maven, you can use the mvn dependency:sources command.