In seam 1.2.1 in RuleBase.java there is the following code: packageDescr = new DrlParser().parse(drlReader); It never checks to see if the parser had any errors and therefore does not log them. Even worse, DrlParser is not a local variable to even have a look at using a debugger, and the Drools code from JBoss doesn't have line numbers enabled for debugging. Unless I am missing something, it doesn't look like there is any way to get error messages from the rules engine for compiler rules. Is that true? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4057056#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...