[jboss-user] [Beginners Corner] - Problem with field extractor - DROOLS

I have recently started using DROOLS and I keep having a problem. I think I am not entirely sure how the field extractors are supposed to work. Basically I need to write a rule that fires when a particular category of object is encountered but drools keeps returning null for the category even though the category has contents. I think the best way to see it is the following code... rule "Test" | | when | $ts : CategorisedTree($category : category) | then | System.out.println($category + " == " + $ts.getCategory() + " ? " + ($category == $ts.getCategory())); | | end and this is the output... null == Relation ? false | null == Type ? false | null == Surname ? false | null == MiddleName ? false | null == FirstName ? false I know I must be missing somthing, can anyone please point me in the right direction? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4146852#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...