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@Stateful @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED) public class ManageAuctionBean implements ManageAuction { @PersistenceContext(type = PersistenceContextType.EXTENDED) EntityManager em; @EJB PaymentDAO paymentDAO; public boolean sellerHasEnoughMoney(User seller) { return paymentDAO.checkLiquidity(seller); } ... }

Copying the files After cleanup, we copy in the new files:

The sellerHashEnoughMoney() method doesn t start a transaction, to avoid automatic flushing of the persistence context on commit in the middle of the conversation. The problem is the call to the DAO, which is a stateless EJB. To get the persistence context propagated into the stateless EJB call, you need to propagate a transaction context. If paymentDAO.checkLiquidity() uses an EntityManager, it gets new persistence context! The second problem lies in the PaymentDAO stateless session bean:

<target name="install-files" depends="clean"> <copy file="${target.warfile}" tofile="${webapp.copied.file}"/> <unzip src="${webapp.copied.file}" dest="${webapp.expanded.dir}"/> </target>

@Stateless public class PaymentDAO { @PersistenceContext EntityManager em;

This leaves us ready to run the application through a server restart or via a management URL call. The paranoid will restart the server, but we will go for the hotupdate. Loading the application Again, a manager URL call will start the program; a <get> against

Summary

public boolean checkLiquidity(User u) { boolean hasMoney = (Boolean) em.createQuery("select...").getSingleResult(); return hasMoney; } ... }

http://localhost:8080/manager/install path=/${target.appname} &war=file://${webapp.expanded.dir}

Because no persistence context is propagated into the checkLiquidity() method when it s called, a new persistence context is created to server this single operation. This is the session-per-operation antipattern! Worse, you now have two (or more) persistence contexts in one request and in the conversation, and you ll run into data aliasing problems (no identity scope guarantee). If you implement your DAOs as stateful session beans, they inherit the persistence context from the calling stateful session bean controller. In this case, the persistence context is propagated through instantiation, not through transaction propagation. Write your DAOs as stateful EJBs if you write your controller as a stateful session bean. This issue is another nasty side effect of the missing FlushMode.MANUAL that can seriously impact how you design and layer applications. We recommend you rely on the Hibernate extension until the EJB 3.0 (or 3.1 ) specification is fixed. With FlushMode.MANUAL, your controllers don t have to use TransactionAttributeType.NOT_SUPPORTED, and the persistence context is always propagated along with your transaction (and you can mix stateless and stateful EJB calls easily). We ll get back to this issue in chapter 16, when we write more complex application code and DAOs.

That s it. It takes a few seconds longer than usual, with the delete, the copy, and the expansion, but it still only takes 15-20 seconds, all in. 18.5.7 Uploading to the remote server We need to get our local installation and configuration files to the remote server. FTP is the path we shall choose, for now. We do all this in our top-level deploy.xml file, a file that resides in the webapp directory and presides over deployment. Configuring the upload First Ant must determine which files are needed at the far end. We don t want to send any more files than are needed, to prevent confusion and maintain security. If we build different WAR files for different targets, it is critical that nobody installs them on the wrong machine; stripping out the other build and configuration files helps achieve this. Although we repeat the same hostname trick of section 18.5.5, we expect the system to usually be called with a remote hostname defined, such as from the command line:

11.5 Summary

The build file loads in the property files for the hostname and makes a list of which files are needed.

In this chapter, you implemented conversations with Hibernate, JPA, and EJB 3.0 components. You learned how to propagate the current Hibernate Session and the persistence context to create more complex layered applications without leaking concerns. You ve also seen that persistence-context propagation is a deeply integrated feature of EJB 3.0 and that a persistence context can be easily bound to the JTA (or CMT) transaction scope. You ve seen how FlushMode.MANUAL, a Hibernate feature, can disable flushing of your persistence context independently from your transaction assembly. Table 11.2 shows a summary you can use to compare native Hibernate features and Java Persistence.