CHAPTER 10 Transactions and concurrency examples, which all (Web hosting mysql)
CHAPTER 10 Transactions and concurrency examples, which all call the Hibernate Transaction API, on a Java EE application server, you need to switch the Hibernate configuration to JTA: The hibernate.transaction.factory_class option must be set to org. hibernate.transaction.JTATransactionFactory. Hibernate needs to know the JTA implementation on which you re deploying, for two reasons: First, different implementations may expose the JTA UserTransaction, which Hibernate has to call internally now, under different names. Second, Hibernate has to hook into the synchronization process of the JTA transaction manager to handle its caches. You have to set the hibernate.transaction.manager_lookup_class option to configure both: for example, to org.hibernate.transaction.JBossTransaction- ManagerLookup. Lookup classes for the most common JTA implementations and application servers are packaged with Hibernate (and can be customized if needed). Check the Javadoc for the package. Hibernate is no longer responsible for managing a JDBC connection pool; it obtains managed database connections from the runtime container. These connections are exposed by the JTA provider through JNDI, a global registry. You must configure Hibernate with the right name for your database resources on JNDI, as you did in chapter 2, section 2.4.1, Integration with JTA. Now the same piece of code you wrote earlier for Java SE directly on top of JDBC will work in a JTA environment with managed datasources: Session session = null; Transaction tx = null; try { session = sessionFactory.openSession(); tx = session.beginTransaction(); tx.setTimeout(5); concludeAuction(session); tx.commit(); } catch (RuntimeException ex) { try { tx.rollback(); } catch (RuntimeException rbEx) { log.error(”Couldn’t roll back transaction”, rbEx); } throw ex;
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