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try { utx.rollback(); } catch (RuntimeException rbEx) { log.error("Couldn't roll back transaction", rbEx); } throw ex; }

17.1 17.2 17.3 17.4 The challenge of native code 407 Using existing build tools 408 Introducing the <cc> task 410 Building a JNI library in Ant 412 17.5 17.6 17.7 17.8 Going cross-platform 422 Looking at <cc> in more detail 425 Distributing native libraries 429 Summary 430

The session1 and session2 persistence context is now flushed automatically during commit of the UserTransaction, and both are closed after the transaction completes. Our advice is to use JTA directly whenever possible. You should always try to move the responsibility for portability outside of the application and, if you can, require deployment in an environment that provides JTA. Programmatic transaction demarcation requires application code written against a transaction demarcation interface. A much nicer approach that avoids any nonportable code spread throughout your application is declarative transaction demarcation. Container-managed transactions Declarative transaction demarcation implies that a container takes care of this concern for you. You declare if and how you want your code to participate in a transaction. The responsibility to provide a container that supports declarative transaction demarcation is again where it belongs, with the application deployer. CMT is a standard feature of Java EE and, in particular, EJB. The code we ll show you next is based on EJB 3.0 session beans ( Java EE only); you define transaction boundaries with annotations. Note that the actual data-access code doesn t change if you have to use the older EJB 2.1 session beans; however, you have to write an EJB deployment descriptor in XML to create your transaction assembly this is optional in EJB 3.0. (A stand-alone JTA implementation doesn t provide container-managed and declarative transactions. However, JBoss Application Server is available as a modular server with a minimal footprint, and it can provide only JTA and an EJB 3.0 container, if needed.) Suppose that an EJB 3.0 session bean implements an action that ends an auction. The code you previously wrote with programmatic JTA transaction demarcation is moved into a stateless session bean:

@Stateless public class ManageAuctionBean implements ManageAuction { @TransactionAttribute(TransactionAttributeType.REQUIRED)

We want to take a quick detour into how to include native code generation into an Ant project. Readers who never have to do this can skip this chapter entirely, returning only when something alters their plans. This chapter will show you how to use Ant to build native code applications and libraries as and when the need arises.

It s likely that a better solution than ORM will exist some day. We (and many others) may have to rethink everything we know about SQL, persistence API standards, and application integration. The evolution of today s systems into true relational database systems with seamless object-oriented integration remains pure speculation. But we can t wait, and there is no sign that any of these issues will improve soon (a multibillion dollar industry isn t very agile). ORM is the best solution currently available, and it s a timesaver for developers facing the object/relational mismatch every day. With EJB 3.0, a specification for full object/relational mapping software that is accepted in the Java industry is finally available.

In a Java software project of any significant complexity, you eventually encounter native code. It may be a native library to access some OS feature not directly supported by Java, which you must bridge to using the Java Native Interface (JNI). It may be a CORBA component bridging to existing code. It may even be a COM object. Alternatively, you may have to write a stand-alone native executable. The build process needs to cover these parts of the project, which means you need to compile native code from Ant. We don t want to add native code into our ongoing application for the sake of it, so we have chosen an example problem that we can use in the application, but whose use is not mandatory. We want to bridge to some native code that extracts and returns the Pentium CPU clock timer: this will give us performance data on our Java code down to individual CPU clock cycles. This code will only work on x86 processors, but 407

Hello World with Hibernate and Java Persistence The toolset for forward and reverse engineering Hibernate configuration and integration