play 2.1.1: Unable to rollback transaction with ebean orm

问题

I have problem with understanding how to work with ebean transactions under play 2.1.1.

    Ebean.execute(txScope, new TxRunnable() {

        public void run() {

            Ebean.beginTransaction();
            System.out.println("[**] : " + Ebean.currentTransaction());
            User user = Ebean.find(User.class, 22);
            user.setPassword("qweqwe125");
            Ebean.save(user);

            user = Ebean.find(User.class, 22);
            user.setPassword("qweqwe126");
            Ebean.rollbackTransaction();
            // or other case
            //Ebean.currentTransaction().rollback();
        }

But in this case I receive error: PersistenceException: The existing transaction still active?

Also I've try to make something like:

@Transactional(type=TxType.REQUIRES_NEW, isolation = TxIsolation.SERIALIZABLE)
public static void transactional2() {
    User user = User.query.getById(22l);
    user.setPassword("qweqwe123");
    user.save();

    Ebean.endTransaction();
}

In this case I receive updated values. Also in last example I've try rollback in this way: Ebean.currentTransaction().end();

But receive NullPointerException error.

Could some one point me to workable example with transactions? Or write some example in comments.

Thanks.

UPDATE

Eventually have found solution:

public static void transactional2() {
    com.avaje.ebean.Ebean.beginTransaction();

    User user = User.query.getById(22l);
    user.setPassword("qweqwe123");
    user.save();

    com.avaje.ebean.Ebean.rollbackTransaction();
    // OR: com.avaje.ebean.Ebean.commitTransaction();

}

回答1:

In short you shouldn't use Ebean.beginTransaction(); Ebean.rollbackTransaction(); or Ebean.commitTransaction(); .... with either @Transactional or Ebean.execute(txScope, new TxRunnable().

So the enhancement of the @Transactional method handles the commit/rollback for you and similarly the Ebean.execute(txScope, new TxRunnable() handles the commit/rollback for you.

If you want to fail a transaction in say Ebean.execute(txScope, ... then throw an exception.

回答2:

Eventually have found solution. Works for me.

public static void transactional2() {
    com.avaje.ebean.Ebean.beginTransaction();

    User user = User.query.getById(22l);
    user.setPassword("qweqwe123");
    user.save();

    com.avaje.ebean.Ebean.rollbackTransaction();
    // OR: com.avaje.ebean.Ebean.commitTransaction();
}

Please add you comments if something wrong with this solution.

Ebean documentation example: http://www.avaje.org/ebean/introtrans_begin.html

来源：https://stackoverflow.com/questions/17076055/play-2-1-1-unable-to-rollback-transaction-with-ebean-orm

标签

java

transactions

playframework-2.1

ebean

traceback