I have written this in my rules file: But I getting this error : [29,0]: [ERR 102] Line 29:0 mismatched input '<eof>' in function "isContained" [0,0]: Parser returned a null Package ----------------------------------------------------------------------------- function boolean isContained(List<String> plist, List<String> clist){        boolean found = true;        for(String s : clist){                if (!plist.contains(s)){                found = false;        }        return found; } rule "GoodBye"    when        m : Message(ls:ls, pids: productIds)        l : List() from ls        eval(isContained(pids,l))    then        System.out.println( "found" ); end -- View this message in context: http://drools.46999.n3.nabble.com/Function-Mismatch-eof-tp3634033p3634033... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users