Yes, the drools jars do not contain any source by default (to limit the size of 
the jars).
There are two ways to use the source of these classes though:

 * When you are trying to debug an application in eclipse, and you open the 

debug dialog (right click your Java main class, select Debug As -> Debug ...), 
there is a tab there you can use to add sources.  If you download the sources 

from svn and import these as Java projects in eclipse, you can just add those 

projects to the source lookup path.  I added a screenshot to help you out with 
that.

 * If you add the sources to the drools jars directly (in the same dir as the 
corresponding class files, so not in a separate src dir or something like 
that), those sources will be found automatically as well.  So rebuilding those 

jars and adding the sources should do the trick for all your projects at once.

Kris