Java - Search for AD Groups and List Group Attributes

Added the ability to search for AD groups and get a Group's Attributes to my LDAP class:

 /**
  * 
  * @param groupName The name of the AD group.
  * @return The AD attributes for the group or null if error.
  * @throws NamingException
  */
    public Attributes getADGroupAttributes(String groupName) throws NamingException {
     this.userName = null;
        String searchFilter = "(&(objectClass=group)(cn=" + groupName + "))";
        SearchControls searchControls = new SearchControls();
        searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);
        NamingEnumeration  results = ctx.search("dc=MYDOMAIN,dc=LOCAL", searchFilter, searchControls);
        SearchResult searchResult = null;
        if(results.hasMoreElements()) {
             searchResult = (SearchResult) results.nextElement();
            //make sure there is not another item available, there should be only 1 match
            if(results.hasMoreElements()) {
                this.strRes = "Matched multiple groups for the group name: " + groupName;
                return null;
            }
        }
        else{
            this.strRes = "No groups found";
            return null;         
        }
        return searchResult.getAttributes();  
    } 
 
    /**
     * 
     * @param groupName The group name to search for. Can use wild cards.
     * @return A comma delimited list of the AD group names
     * @throws NamingException
     */
    public String searchforADGroup(String groupName) throws NamingException {
     this.userName = null;
        String searchFilter = "(&(objectClass=group)(cn=" + groupName + "))";
        SearchControls searchControls = new SearchControls();
        searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);
        NamingEnumeration  results = ctx.search("dc=MYDOMAIN,dc=LOCAL", searchFilter, searchControls);
        SearchResult searchResult = null;
        String strGroups = "";
        if(results!= null) {
         try {
    while(results.hasMore()) {
     searchResult = (SearchResult) results.nextElement();
     strGroups = strGroups + searchResult.getAttributes().get("cn") + ",";
    }
   } catch (Exception e) {

   }
        }
        else{
            this.strRes = "No groups found";
            return null;         
        }
        return strGroups;  
    }