This is my rules file and its throwing this error: [ isContained : unable to resolve type while building function  ] -------------------------------------------------------------------------------- package com.sample import com.sample.DroolsTest.Message; import com.sample.DroolsTest.Result; import com.sample.DroolsTest.Discount; import java.util.Arrays; import java.util.List; 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 Thanks, --GG -- View this message in context: http://drools.46999.n3.nabble.com/Uable-to-reolve-type-tp3634048p3634048.... 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