Setting LDAP Context Request Controls
This example uses the JNDI/LDAP service provider to connect to an LDAP server on the local machine. It sets the context's request controls to be a server-side Sort control and then performs a list(). The results of list() will be sorted. 

 
 try {
     LdapContext ctx = new InitialLdapContext(
       env, null);
     
     // Create critical Sort that sorts based on CN
     Control[] ctxCtls = new Control[]{
         new SortControl(
           new String[]{"cn"}, Control.CRITICAL)
     };
     
     // Sets context request controls; effect until
       // unset
     ctx.setRequestControls(ctxCtls);
   
     // Perform list() with controls in effect
     NamingEnumeration answer = ctx.list("");
     
     // Enumerate answers
     while (answer.hasMore()) {
         NameClassPair item = 
           (NameClassPair)answer.next();
     }
 } catch (NamingException e) {
 }