UserTransaction 객체를 가져오는 방법

   import javax.transaction.*;
  import javax.naming.*;


  InitialContext ctx = new InitialContext();
  UserTransaction tx1 = (UserTransaction)ctx.lookup("java:comp/UserTransaction");

  tx1.begin();

  try{

        tx1.commit();
  } catch ( Exception e )   {
        tx1.rollback();

  }