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You also want stateless or stateful session beans, components that you can use to encapsulate your application logic Inside these components, you need the services of the container: for example, you usually want the container to inject an EntityManager, so that you can load and store entity instances..

antfile = cruisecontrol.xml auxlogfiles = modificationset.file, test.data.dir mailhost = <our mail server>

Remember how you create an instance of an EntityManager in Java SE You have to open it from an EntityManagerFactory and close it manually. You also have to begin and end a resource-local transaction with the EntityTransaction interface. In an EJB 3.0 server, a container-managed EntityManager is available through dependency injection. Consider the following EJB session bean that implements a particular action in the CaveatEmptor application:

There are several other properties to control the master and clean build target names, the cycle interval between clean builds, time interval between build cycles, the URL to the build servlet, email mapping file, several other email notification options, and a custom build-label incrementer. The auxlogfiles property deserves some mention. It is a comma-separated list of Ant property names that represent either files or directories. The modificationset.file is the default value, and we added test.data.dir. As covered in chapter 4, our <junit> and <junitreport> tasks save files to this directory. When a build completes, the build log, modification set data, and XML files specified by auxlogfiles (or if the property is a directory, XML files in that directory) are put into a single XML file. The log files are then accessible to the reporting web application.

@Stateless public class ManageAuctionBean implements ManageAuction { // Use field injection:

@PersistenceContext private EntityManager em; // // // // // // or setter injection: @PersistenceContext public void setEntityManager(EntityManager em) { this.em = em; }

By ensuring that Ant property names are used for build output, it becomes very easy to interface with external systems such as CruiseControl the properties are simply overridden when run with CruiseControl to allow output to be collected where CruiseControl desires.

@TransactionAttribute(TransactionAttributeType.REQUIRED) public Item findAuctionByName(String name) { return (Item) em.createQuery()... ... } }

Starting the CruiseControl runner The CruiseControl distribution provides .bat and .sh startup scripts. Working on a Windows machine, we used cruiseControl.bat as a basis, renaming it cc.bat. We copied this file into our application directory and modified it to match our environment. CruiseControl 1.2.1a is built on Ant 1.4, but we are using Ant 1.5 so it required adjustments to the classpath used. We recommend that you try the standard CruiseControl scripts, but expect that there will be issues that require fine tuning. Starting CruiseControl for the first time requires some one-time initialization parameters. Running cc.bat without these parameters generates the details to help decipher what to do next:

It s a stateless action, and it implements the ManageAuction interface These details of stateless EJBs aren t our concern at this time, what is interesting is that you can access the EntityManager in the findAuctionByName() method of the action The container automatically injects an instance of an EntityManager into the em field of the bean, before the action method executes The visibility of the field isn t important for the container, but you need to apply the @PersistenceContext annotation to indicate that you want the container s service You could also create a public setter method for this field and apply the annotation on this method This is the recommended approach if you also plan to set the EntityManager manually for example, during integration or functional testing The injected EntityManager is maintained by the container.

[masterbuild] ***** Starting automated build process ***** Reading build information from : c:\AntBook\app\buildcycleinfo Cannot read build information. Usage: Starts a continuous integration loop

You don t have to flush or close it, nor do you have to start and end a transaction in the previous example you tell the container that the findAuctionByName() method of the session bean requires a transaction (This is the default for all EJB session bean methods) A transaction must be active when the method is called by a client (or a new transaction is started automatically) When the method returns, the transaction either continues or is committed, depending on whether it was started for this method The persistence context of the injected container-managed EntityManager is bound to the scope of the transaction, Hence, it s flushed automatically and closed when the transaction ends.