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If the classpath is not complex and the arguments to the application are simple, calling Java programs from the command line is not particularly hard, just a manual process. We still want to run our program from the build file, not just to show it is possible, but because it provides some tangible benefits the moment we do so: A target to run the program can depend upon the compilation target, so we know we are always running the latest version of the code. It is easy to pass complex arguments to the program. It is easier to set up the classpath. The program can run inside Ant s own JVM; so it loads faster. You can halt a build if the return code of the program is not zero. The fact that the execute target can be made to depend on the compile target is one of the key benefits during development. There is simply no need to split program compilation from execution.

Another reason for accessing your EntityManagerFactory may be that you want to access a particular vendor extension on this interface, like we discussed in chapter 2, section 2.2.4, Switching to Hibernate interfaces. You can also look up an EntityManagerFactory if you bind it to the EJB s naming context first:

Requires a somewhat involved modification to your build file and requires an understanding of Ant s optional SCM tasks for your particular repository Perhaps in the future, the CruiseControl engine itself could deal with the SCM and not require build file modifications In all fairness, CruiseControl ships with examples for many repositories that can be cut and pasted into your project The auxlogfiles feature does not recursively process XML files This would have been useful in our situation, where we are running a build of many subprojects from a single master build Although we could handle this situation by having a separate Ant output property for each subproject, or by making sure all file names generated are unique, it would require some effort to handle these ourselves Version labeling is not integrated with the SCM.

@Stateless @PersistenceUnit(name= "emf/auction", unitName = "auctionDB") public class ManageAuctionBean implements ManageAuction { @Resource SessionContext ctx; @TransactionAttribute(TransactionAttributeType.REQUIRED) public Item findAuctionByName(String name) { EntityManagerFactory auctionDB = (EntityManagerFactory) ctx.lookup("emf/auction"); EntityManager em = auctionDB.createEntityManager(); ... Item item = (Item) em.createQuery()... ... em.flush(); em.close(); return item; } }

The labels assigned to successful builds by CruiseControl is merely an identifier on the log files We could implement such labeling as part of our build process ourselves, because CruiseControl provides the label as an Ant property label Multiple projects would require multiple runners configured, and you would likely want separate web applications for each Things we really liked about CruiseControl include: Once it is set up and starts running it s very reliable Reporting is well done, attractive, and easily customizable The ability to incorporate any XML file into the results provides great extensibility Version label incrementing can be customized Direct emailing to the developer(s) that broke the build Highly configurable email settings, even with group aliases The best thing about CruiseControl is that once it is working, it works very well.

Again, there is no particular advantage if you compare the lookup technique with automatic injection.

Summary

It provides an automated build and test system that harangues developers when they break something, while management gets a web view that keeps them happy Because it can run tests from a build file, the more JUnit, HttpUnit, Cactus, or other Anthosted tests you write, the more testing you can do on a system And, of course, the more testing you do, the better your product becomes..

We ve covered a lot of ground in this chapter. You now know that the basic interfaces in Java Persistence aren t much different from those provided by Hibernate. Loading and storing objects is almost the same. The scope of the persistence context is slightly different, though; in Hibernate, it s by default the same as the Session scope. In Java Persistence, the scope of the persistence context varies, depending on whether you create an EntityManager yourself, or you let the container manage and bind it to the current transaction scope in an EJB component. Table 9.1 shows a summary you can use to compare native Hibernate features and Java Persistence. We ve already talked about conversations in an application and how you can design them with detached objects or with an extended persistence context. Although we haven t had time to discuss every detail, you can probably already see

Anthill is a freely available continuous integration tool created by Urbancode (http:// www.urbancode.com). Anthill integrates with your SCM system (currently only a CVS adapter is provided) and runs scheduled automated builds through an installed web application. Not only are build results made available through the web interface, but project build artifacts can also be made available. These artifacts typically include Javadoc API documentation, and source and binary distributions. The Anthill distribution also includes Java2HTML,1 which produces hyperlinked and color-coded