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Several things are happening in this code snippet: First, you declare that you want the component environment of the bean populated with an EntityManager and that the name of the bound reference is supposed to be em/auction. The full name in JNDI is java:comp/env/em/auction the java:comp/env/ part is the so called bean-naming context. Everything in that subcontext of JNDI is bean-dependent. In other words, the EJB container reads this annotation and knows that it has to bind an EntityManager for this bean only, at runtime when the bean executes, under the namespace in JNDI that is reserved for this bean. You look up the EntityManager in your bean implementation with the help of the SessionContext. The benefit of this context is that it automatically prefixes the name you re looking for with java:comp/env/; hence, it tries to find the reference in the bean s naming context, and not the global JNDI namespace. The @Resource annotation instructs the EJB container to inject the SessionContext for you. A persistence context is created by the container when the first method on the EntityManager is called, and it s flushed and closed when the transaction ends when the method returns. Injection and lookup are also available if you need an EntityManagerFactory.

This behavior can be unexpected to anyone experienced in other build tools, as it seems to add extra work rather than save work by sharing dependencies. However, if you 38

An EJB container also allows you to access an EntityManagerFactory for a persistence unit directly. Without a managed environment, you have to create the EntityManagerFactory with the help of the Persistence bootstrap class. In a

look closely, the second time Ant executes the compile target it does no work; the tasks get executed but their dependency checking stops existing outputs being rebuilt. Our next question is this: when a target lists multiple dependencies, does Ant execute them in the order listed The answer is yes, unless other dependency rules prevent it. Imagine if we modified the archive target with the dependency attribute depends="compile,init". A simple left-to-right execution order would run the compile target before it was initialized. Ant would try to execute the targets in this order, but because the compile target depends upon init, Ant will call init first. This subtle detail can catch you out. If you try to control the execution order by listing targets in order, you may not get the results you expect as explicit dependencies always take priority.

container, you can again utilize automatic dependency injection to get an EntityManagerFactory:

We now have a structured build process that creates the JAR file from the Java source. At this point the next steps could be to run tests on the code, distribute it, or deploy it. We shall be covering how to do all these things in the following chapters. For now, we just want to run the program.

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

The unitName attribute is optional and only required if you have more than one configured persistence unit (several databases). The EntityManager you created from the injected factory is again application-managed the container won t flush this persistence context, nor close it. It s rare that you mix container-managed factories with application-managed EntityManager instances, but doing so is useful if you need more control over the lifecycle of an EntityManager in an EJB component. You may create an EntityManager outside of any JTA transaction boundaries; for example, in an EJB method that doesn t require a transaction context. It s then your responsibility to notify the EntityManager that a JTA transaction is active, when needed, with the joinTransaction() method. Note that this operation doesn t bind or scope the persistence context to the JTA transaction; it s only a hint that switches the EntityManager to transactional behavior internally. The previous statements aren t complete: If you close() the EntityManager, it doesn t immediately close its persistence context, if this persistence context has been associated with a transaction. The persistence context is closed when the transaction completes. However, any call of the closed EntityManager throws an exception (except for the getTransaction() method in Java SE and the isOpen() method). You can switch this behavior with the hibernate. ejb.discard_ pc_on_close configuration setting. You don t have to worry about this if you never call the EntityManager outside of transaction boundaries.

Why execute from inside Ant We could just call our program from the command line, stating the classpath, the name of the entry point and the arguments:

Summary