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CHAPTER 5 BUSINESS SERVICES WITH JBOSS
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Out of the box, JBoss has a service layer that provides a set of services that implements the Java EE 1.4 stack. Later in this chapter you ll see how to use and manage the available JBoss services and how to add third-party services to fulfill the needs of your applications. The set of services that compose the Java EE 1.4 technology stack are provided by the following pre-packaged services available in the JBoss AS: JBossServer: An advanced EJB container and JMX bus JBossMQ: A JMS provider (to be replaced by JBoss Messaging) JBossTX: For JTA/JTS transactions JBossCMP: Container-Managed Persistence Engine JBossSX: For JAAS-based security JBossCX: For Java Connector Architecture (JCA) connectivity JBossMail: Java mail provider JBossWeb: An integrated Apache Tomcat container Overseeing the deployment and inter-service messages is an aspect layer composed of pipelines of interceptors that decorate certain aspects of the functionality of a service and its interaction with other services. For example, in the JBoss EJB container is a pipeline of interceptors providing a myriad of services such as persistence and security, among others. At the top of the hierarchy lies the application layer where your applications live. JBoss applications have the flexibility to use the services provided by the container either programmatically, via the use of deployment descriptors, or via Java SE version 1.5 metadata (JSR-175).
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The Java metadata facility was introduced with Java SE version 1.5 in the form of annotations which are built in language constructs that can be applied at the class, property, or method level to provide meta information directly in a Java class. Annotations are preceded by the @ sign and can optionally take parameters. In Java EE they help to eliminate many glue classes, container contract classes, and many redundant XML deployment descriptors. Whenever possible and if adequate I will use annotations in code rather than external configuration files.
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Figure 5-1 shows an architectural diagram of the JBoss AS. Readers interested in finding out more on the inner workings of JBoss AS should start by exploring the JMX API, Java s Dynamic Proxy API, and Rickard Oeberg s Interceptor Stack, the pattern at the heart of the JBoss containers. To learn more about the JBoss server architecture, see the JBoss Application Server Guide located at http://docs.jboss.org/jbossas/ jboss4guide/r4/html.
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Figure 5-1. JBoss AS architecture
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Installing and Configuring JBoss
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JBoss AS is distributed as a single zip/tar file or as a convenient visual installer (also available via Java Web Start) and is hosted on www.sourceforge.net. Go to www.jboss.com/products/jbossas/ downloads and follow the instructions to obtain a distribution. I recommend that you use the visual installer since it simplifies the installation greatly. The version of JBoss used in this book is JBoss AS 4.0.3. If you re using the graphical installer, select the full product installation containing the EJB3 functionality. The visual installer is distributed as an executable JAR file; for version 4.0.3 this file is jboss-4.0.3-installer.jar. To start the installation double-click the JAR file (in Windows XP) or on a command shell type: java jar jboss-4.0.3-installer.jar The installation will present a step-by-step wizard that will allow you to select an installation directory, the language of the installation, and the type of installation. Figure 5-2 shows the installation type selection screen. As previously mentioned, for the examples in this book you ll need to select the all installation.
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Figure 5-2. JBoss AS installation type selection Another installation option of importance is shown in Figure 5-3. You need to choose between the available class loading schemes and whether to restrict calls between in-container components to use call-by-value semantics versus the default call-by-reference (which is much more efficient).
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Figure 5-3. JBoss AS installation class loading and invocation mode selection
CHAPTER 5 BUSINESS SERVICES WITH JBOSS
The final installation step of importance, as shown in Figure 5-4, allows for the JMX administrative interfaces to the application server to be secured. This is important if you are setting up a production environment; for a development installation you can choose to bypass this step.
Figure 5-4. JBoss AS installation JMX security settings Once the installation process has completed you can start the application server by changing directories to the bin directory under the JBoss AS installation directory and running the run.bat Windows batch file or the UNIX shell script run.sh. The console output should resemble the following: =============================================================================== . JBoss Bootstrap Environment . JBOSS_HOME: C:\java\jboss-4.0.3RC1\bin\\.. . JAVA: C:\jdk1.5.0_04\bin\java . JAVA_OPTS: -Dprogram.name=run.bat -Xms128m -Xmx512m . CLASSPATH: C:\jdk1.5.0_04\lib\tools.jar;C:\java\jboss-4.0.3RC1\bin\\run.jar . =============================================================================== .
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