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stand on the shoulders of the daily builds of all the tools you depend upon. That may seem a bit bleeding edge, and sometimes it is, but another way to look at it is as continuous integration raised up a notch. You are no longer integrating your code against older versions of libraries; you are building on a daily basis against the latest code developed. This may seem unduly hazardous, but open-source developers tend to put all bug fixes at the head of the CVS tree, and prefer bug reports from the nightly build, too. Bug reports with old versions are less welcome, because someone has to determine whether the problem has already gone away. Generating the scripts From a command prompt at the main Gump directory, execute either gen.bat or gen.sh, depending on the platform you re using. This script uses the workspace configuration file and any other needed configuration files to build scripts specific to your platform and settings. These scripts are built to the basedir specified in the workspace definition. Updating and building The generation process creates an update.bat/.sh file and a build.bat/.sh file. First execute the update script, which updates the local copy of the project from the repository. Next, execute the build script to build all projects in their dependency order. Automating these steps is simply a matter of wrapping them in a recurring job. See section 16.1 for additional details on scheduling a job on your platform. 16.4.2 How Gump works Gump does a fantastic job at modeling complex build processes. It separates the concepts of project, module, repository, profile, and workspace into individual XML configuration files, allowing them to be reused easily. Table 16.1 defines these concepts further.

isn t the only way to get them. You can obtain a stand-alone JTA provider if managed resources are all you need. Open source stand-alone JTA providers include JBoss Transactions (http://www.jboss.com/products/transactions), ObjectWeb JOTM (http://jotm.objectweb.org), and others. You can install such a JTA service along with your Hibernate application (in Tomcat, for example). It will manage a pool of database connections for you, provide JTA interfaces for transaction demarcation, and provide managed database connections through a JNDI registry. The following are benefits of managed resources with JTA and reasons to use this Java EE service:

Table 16.1 Gump s configuration files Definition Represents a buildable project or an installable package such as a fixed external library. The project definition names the JARs that it exports, which are available to dependent projects. A collection of projects stored in a single repository. Defines the CVS information needed to access repositories such as SourceForge, Jakarta, or your own CVS server. Defines a collection of projects and repositories. Global controlling configuration. Defines which projects are built, directly or via profile definitions. Platform-specific and path information is kept here.

A transaction-management service can unify all resources, no matter of what type, and expose transaction control to you with a single standardized API. This means that you can replace the Hibernate Transaction API and use JTA directly everywhere. It s then the responsibility of the application deployer to install the application on (or with) a JTA-compatible runtime environment. This strategy moves portability concerns where they belong; the application relies on standardized Java EE interfaces, and the runtime environment has to provide an implementation. A Java EE transaction manager can enlist multiple resources in a single transaction. If you work with several databases (or more than one resource), you probably want a two-phase commit protocol to guarantee atomicity of a transaction across resource boundaries. In such a scenario, Hibernate is configured with several SessionFactorys, one for each database, and their Sessions obtain managed database connections that all participate in the same system transaction. The quality of JTA implementations is usually higher compared to simple JDBC connection pools. Application servers and stand-alone JTA providers that are modules of application servers usually have had more testing in high-end systems with a large transaction volume.

Figure 16.7 illustrates Gump output for a typical run, this particular one using JDK 1.4. It demonstrates that not only does Gump show build failures, it also shows whether a project cannot be built because a prerequisite failed, which is noted by a different status. Build failures can trigger email nags, but you need to install Perl to use this feature.

JTA providers don t add unnecessary overhead at runtime (a common misconception). The simple case (a single JDBC database) is handled as efficiently as with plain JDBC transactions. The connection pool managed behind a JTA service is probably much better software than a random connection pooling library you d use with plain JDBC.

Let s assume that you aren t sold on JTA and that you want to continue using the Hibernate Transaction API to keep your code runnable in Java SE and with managed Java EE services, without any code changes. To deploy the previous code

Figure 16.7 How the failure of one open-source project to build breaks everything else. Here Xalan is broken, which stops Ant from building, so nothing else will be built either.

examples, which all call the Hibernate Transaction API, on a Java EE application server, you need to switch the Hibernate configuration to JTA: