How to cite a web site - Transaction essentials } finally { session.close(); } However,
Transaction essentials } finally { session.close(); } However, the database connection-handling is slightly different. Hibernate obtains a managed database connection for each Session you re using and, again, tries to be as lazy as possible. Without JTA, Hibernate would hold on to a particular database connection from the beginning until the end of the transaction. With a JTA configuration, Hibernate is even more aggressive: A connection is obtained and used for only a single SQL statement and then is immediately returned to the managed connection pool. The application server guarantees that it will hand out the same connection during the same transaction, when it s needed again for another SQL statement. This aggressive connection-release mode is Hibernate s internal behavior, and it doesn t make any difference for your application and how you write code. (Hence, the code example is line-by-line the same as the last one.) A JTA system supports global transaction timeouts; it can monitor transactions. So, setTimeout() now controls the global JTA timeout setting equivalent to calling UserTransaction.setTransactionTimeout(). The Hibernate Transaction API guarantees portability with a simple change of Hibernate configuration. If you want to move this responsibility to the application deployer, you should write your code against the standardized JTA interface, instead. To make the following example a little more interesting, you ll also work with two databases (two SessionFactorys) inside the same system transaction: UserTransaction utx = (UserTransaction) new InitialContext() .lookup(”java:comp/UserTransaction”); Session session1 = null; Session session2 = null; try { utx.begin(); session1 = auctionDatabase.openSession(); session2 = billingDatabase.openSession(); concludeAuction(session1); billAuction(session2); session1.flush(); session2.flush(); utx.commit(); } catch (RuntimeException ex) { try {
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