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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:

No. CVS, VSS, ClearCase, MKS, Perforce, PVCS, StarTeam, and file system. No (you have to code this into your build file manually).

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 {

utx.rollback(); } catch (RuntimeException rbEx) { log.error("Couldn't roll back transaction", rbEx); } throw ex; } finally { session1.close(); session2.close(); }

Process to support Set up another instance Add another project multiple project builds of the runner application definition through the and configure each web interface. project's build file with the CruiseControl hooks. Version labeling Default and custom labeling are available. SCM is not tagged. Default and custom labeling are available. SCM is tagged automatically after successful builds.

(Note that this code snippet can throw some other, checked exceptions, like a NamingException from the JNDI lookup. You need to handle these accordingly.) First, a handle on a JTA UserTransaction must be obtained from the JNDI registry. Then, you begin and end a transaction, and the (container-provided) database connections used by all Hibernate Sessions are enlisted in that transaction automatically. Even if you aren t using the Transaction API, you should still configure hibernate.transaction.factory_class and hibernate.transaction. manager_lookup_class for JTA and your environment, so that Hibernate can interact with the transaction system internally. With default settings, it s also your responsibility to flush() each Session manually to synchronize it with the database (to execute all SQL DML). The Hibernate Transaction API did this automatically for you. You also have to close all Sessions manually. On the other hand, you can enable the hibernate.transaction.flush_before_completion and/or the hibernate.transaction.auto_ close_session configuration options and let Hibernate take care of this for you again flushing and closing is then part of the internal synchronization procedure of the transaction manager and occurs before (and after, respectively) the JTA transaction ends. With these two settings enabled the code can be simplified to the following:

Add another project to your profile or workspace configuration and regenerate/rerun the scripts. Builds are timestamped; no other labeling support is provided. SCM is not tagged.

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); utx.commit(); } catch (RuntimeException ex) {

Continuous integration is a necessary step in taming the complexities we continue to introduce into our software development lives. Projects are more complex, time scales are shorter, teams are becoming distributed, making communication more difficult, and many other forces are acting against our ability to maintain tight control over our process. We covered four ways to implement a continuous integration process into your development environment that can really help keep a handle on growing complexities. If you are using a CVS repository, you have all these options to explore, but with any other repository your options are either to implement your own custom automated build process or to use CruiseControl. We would be doing a disservice to each of these fine tools to recommend one over the others, as they each have pros and cons. Nevertheless, here is a quick set of good points of each: Custom shell scripting build automation Quick and easy, and of course highly customizable! CruiseControl Excellent reporting and default support for reporting unit test results. Anthill Easy installation and full control through the web application. Gump The only game in town if you need interproject dependencies and cross-reference reporting. Installation and configuration of all of these continuous integration tools require a bit of effort, but in the end, it is effort well spent. Regardless of the tool you use, having automated builds with failure email notification is a wonderful thing. We can make one unequivocal recommendation: use continuous integration in your projects!