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All DAO methods you re calling require a transaction context. If you don t start a transaction for each method in the conversation controller, the transaction boundary is a call on one of the data-access objects. However, you want the createItem(), addImages(), and submit() methods to be the scope of the transaction, in case you execute several DAO operations. You have an extended persistence context that is automatically scoped and bound to the stateful session bean. Because the DAOs are stateless session beans, this single persistence context can be propagated into all DAOs only

Trusted Sites Contains Web sites that are believed to be safe. There are no sites in this zone by default. You can add sites to this zone as you see fit by selecting the zone and clicking Sites. Restricted Sites Contains Web sites that could potentially be harmful. There are no sites in this zone by default. You can add sites to this zone as you see fit by selecting the zone and clicking Sites.

Figure 16-16

when a transaction context is active and propagated as well. If the DAOs are stateful session beans, you can propagate the current persistence context through instantiation even when there is no transaction context for a DAO call, but that also means the conversation controller must destroy any stateful DAOs manually. Without the Hibernate extension property, you d have to make your DAOs stateful session beans to allow propagation of the persistence context between nontransactional method calls. It would then be the responsibility of the controller to call the @Remove method of each DAO in its own @Remove method you don t want either. You want to disable flushing without writing any nontransactional methods. EJB 3.0 includes many more injection features, and they extend to other Java EE 5.0 specifications. For example, you can use @EJB injection in a Java servlet container, or @Resource to get any named resource from JNDI injected automatically. However, these features are outside the scope of this book. Now that you ve created application layers, you need a way to test them for correctness.

The security levels that you can configure are as follows:

High, which is appropriate for sites that might have harmful content. The Restricted Sites zone has a High security level.

Testing is probably the single most important activity in which a Java developer engages during a day of work. Testing determines the correctness of the system from a functional standpoint as well as from a performance and scalability perspective. Successfully executing tests means that all application components and layers interact correctly and work together smoothly and as specified. You can test and proof a software system many different ways. In the context of persistence and data management, you re naturally most interested in automated tests. In the following sections, you create many kinds of tests that you can run repeatedly to check the correct behavior of your application. First we look at different categories of tests. Functional, integration, and standalone unit testing all have a different goal and purpose, and you need to know when each strategy is appropriate. We then write tests and introduce the TestNG framework (http://www.testng.org). Finally, we consider stress and load testing and how you can find out whether your system will scale to a high number of concurrent transactions.

Less-secure features are disabled. The safest way to browse, but functionality is potentially lost.

1. 2. 3. 4. 5. 6. 7. 8.

Medium, which is appropriate for most Internet sites. The Internet and Local Intranet zones have a Medium security level.

We categorize software testing as follows:

Prompts before downloading potentially unsafe content. Unsigned ActiveX controls are not downloaded. Most content is run without prompts. Unsigned ActiveX controls are not downloaded.

Configuring Internet Explorer Options 16-49