Greg Zoller [http://community.jboss.org/people/gwzoller] created the discussion "Newbie Drools Rule-Writing Question" To view the discussion, visit: http://community.jboss.org/message/538052#538052 -------------------------------------------------------------- Hello, I'm trying to write a drools rule for the following situation: I have a user profile object containing a list of Strings representing the roles this user has been granted. I need a drools rule pattern that matches true if there is an intersection between the user's roles and a list of given roles. In Java the rule logic would be:      ArrayList<String> okRoles = new ArrayList<String>();      okRoles.add("Internal");      okRoles.add("Admin");      Profile profile = // get profile from wherever...contains list of user's roles: {"User","Internal"}      if( okRoles.retainAll( profile.getRoles() ) == false ) {           // successful match      } How can I do similar match logic in Drools?  Here's where I'm at so far: rule "Test1"     when         Profile(roles in ("Internal","Admin"))     then         System.out.println("Found role match!"); end This rule actually runs w/o crashing, but fails to match...presumably because getRoles() returns a list of roles and the list is not in ("ROLE_BUYER"). Any hints how I can accomplish this? Thanks! Greg -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/538052#538052] Start a new discussion in Beginner's Corner at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]