LDAPConstraints constraints = new LDAPConstraints();
conn.setConstraints( constraints );
// referrals failure
LDAPAttribute attribute = new LDAPAttribute( "ou", "Machines" );
LDAPModification mod = new LDAPModification( LDAPModification.ADD, attribute );
LDAPResponseListener listener = null;
LDAPResponse response = null;
listener = conn.modify( "ou=Computers,uid=akarasuluref,ou=users,ou=system", mod, null, constraints );
response = listener.getResponse();