Thanks Jaikiran, unfortunately didn't really help.
Based on the version you mentioned, went to Eclipse website (http://archive.eclipse.org/eclipse/downloads/drops/R-2.1.3-200403101828/) and downloaded the full Eclipse sources (since the JDT Runtime Binary download is only what it says, runtime, no sources). Unpacked those, created an Eclipse project, unfortunately I found out that the debugging lines are not the same as the sources lines, so the Eclipse sources are different than whatever JBoss used.
Any chance someone could add the sources to the repository you mentioned (https://repository.jboss.org/nexus/content/repositories/releases/jboss/web/jasper-jdt/2.1.3.GA/) ?
Is there other way of getting the sources (create some cvs/svn user, pull a certain branch of the repository? )
thanks, sorry for the bother.
Ranjix