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This extracts the hostname from both the Windows NT and the Unix environment variables. Apparently, it does not work on Mac OS X; non-Unix platforms are an unknown. We have a <hostname> task in the pipeline that will work across all platforms, but it came in too late for Ant 1.5. Loading in the system-specific details With the hostname, we can load in hostname-specific properties

If a container-provided (through injection or obtained through lookup) EntityManager is invoked for the first time, a persistence context begins. By default, it s transaction-scoped and closes when the system transaction is committed or rolled back. It s automatically flushed when the transaction is committed.

<property name="config.file" location="install-${hostname}.properties"/> <property file="${config.file}" /> <property file="common.properties" />

If a container-provided (through injection or obtained through lookup) EntityManager is invoked for the first time, a persistence context begins. If no system transaction is active at that time, the persistence context is short and serves only the single method call. Any SQL triggered by any such method call executes on a database connection in autocommit mode. All entity instances that are (possibly) retrieved in that EntityManager call become detached immediately. If a stateless component (such as ItemDAO) is invoked, and the caller has an active transaction and the transaction is propagated into the called component (because ItemDAO methods require or support transactions), any persistence context bound to the JTA transaction is propagated with the transaction. If a stateless component (such as ItemDAO) is invoked, and the caller doesn t have an active transaction (for example, ManageAuction.endAuction() doesn t start a transaction), or the transaction isn t propagated into the called component (because ItemDAO methods don t require or support a transaction), a new persistence context is created when the EntityManager is called inside the stateless component. In other words, no propagation of a persistence context occurs if no transaction is propagated.

These steps read in the configuration file type for the local system, such as this one:

These rules look complex if you read only the formal definition; however, in practice they translate into a natural behavior. The persistence context is automatically scoped and bound to the JTA system transaction, if there is one you only have to learn the rules for transaction propagation to know how the persistence context is propagated. If there is no JTA system transaction, the persistence context serves a single EntityManager call. You used TransactionAttributeType.REQUIRED in almost all the examples so far. This is the most common attribute applied in transaction assemblies; after all, EJB is a programming model for transactional processing. Only once did we show TransactionAttributeType.NOT_SUPPORTED, when we discussed nontransactional data access with a Hibernate Session in chapter 10 section 10.3.3, Optional transactions with JTA . Also remember that you need nontransactional data access in JPA, to disable automatic flushing of the persistence context in a long conversation the problem of the missing FlushMode.MANUAL again. We now take a closer look at the transaction attribute types and how you can implement a conversation with EJBs and manual flushing of an extended persistence context.

In the previous section, you only worked with persistence contexts that were scoped to the JTA system transaction. The container injected an EntityManager automatically, and it transparently handled the persistence context flushing and closing. If you want to implement a conversation with EJBs and an extended persistence context, you have two choices:

Ant then loads the common properties file, containing the definitions you do not want to duplicate:

You can write a stateful session bean as a conversation controller. The persistence context can be automatically scoped to the lifecycle of the stateful bean, which is a convenient approach. The persistence context is closed automatically when the stateful EJB is removed. You can create an EntityManager yourself with the EntityManagerFactory. The persistence context of this EntityManager is application-managed you must flush and close it manually. You also have to use the joinTransaction() operation to notify the EntityManager if you call it inside JTA transaction boundaries. You ll almost always prefer the first strategy with stateful session beans.

Handing off to the specific build files With the name of our application server, Ant can choose the appropriate build file for the install: