Java Hibernate save an object and update a different object using the same session in the same transaction only update and not save

Question

What I'm trying to do is when the customer order a product the order will be save to the DB and that product will be updated.

Session session = factory.openSession();
Transaction t = session.beginTransaction();

        try {
            session.update(product);
            session.save(order);
            t.commit();
        }
        catch (Exception e) {
            t.rollback();
        }
        finally {
            session.close();
        }

The product and the order are 2 different object type. I got no exception when running this code but only the product got updated, the order was not saved.

Sorry for my bad English.

Answer 1

You probably forgot to start your transaction, by not calling the t.begin method. Also, there are some problems with your try-catch statement, since the factory.openSession and session.beginTransaction should be inside the try block, since both can raise exceptions. Try the following example code:

Session session = null;
Transaction t = null;

try {
  session = factory.openSession();
  t = session.beginTransaction();
  t.begin()

  session.update(product);
  session.save(order);

  t.commit();
}
catch (Exception e) {
  if (t != null) {
    t.rollback();
  }
}
finally {
  if (session != null) {
    session.close();
  }
}

Answer 2

Usually I use persist for saving new entries to the database.

By the way, I encourage you to use the try-with-resource to avoid adding the finally block at the end