On the user forum, I've often seen questions like this:
"- Can I trace which rules are executed with what bounded variables and in which order"
Debugging in the IDE's doesn't cut it (eclipse plugin is borked and intellij/netbeans doesn't support debugging DRL).
Instead something like this in the code would help:
Then the user just has to do this in his logback.xml (or similar in log4j.xml):