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Listing 2.16 Hello World main application code, calling EJBs
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package hello; import org.jboss.ejb3.embedded.EJB3StandaloneBootstrap; import javax.naming.InitialContext; public class HelloWorld { public static void main(String[] args) throws Exception { // Boot the JBoss Microcontainer with EJB3 settings, automatically // loads ejb3-interceptors-aop.xml and embedded-jboss-beans.xml EJB3StandaloneBootstrap.boot(null); // Deploy custom stateless beans (datasource, mostly) EJB3StandaloneBootstrap .deployXmlResource("META-INF/helloworld-beans.xml"); // Deploy all EJBs found on classpath (slow, scans all) // EJB3StandaloneBootstrap.scanClasspath(); // Deploy all EJBs found on classpath (fast, scans build directory) // This is a relative location, matching the substring end of one // of java.class.path locations. Print out the value of // System.getProperty("java.class.path") to see all paths. EJB3StandaloneBootstrap.scanClasspath("helloworld-ejb3/bin"); // Create InitialContext from jndi.properties
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InitialContext initialContext = new InitialContext(); // Look up the stateless MessageHandler EJB MessageHandler msgHandler = (MessageHandler) initialContext .lookup("MessageHandlerBean/local"); // Call the stateless EJB msgHandler.saveMessages(); msgHandler.showMessages(); // Shut down EJB container EJB3StandaloneBootstrap.shutdown(); } }
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The first command in main() boots the server s kernel and deploys the base services found in the service configuration files. Next, the datasource factory configuration you created earlier in helloworld-beans.xml is deployed, and the datasource is bound to JNDI by the container. From that point on, the container is ready to deploy EJBs. The easiest (but often not the fastest) way to deploy all EJBs is to let the container search the whole classpath for any class that has an EJB annotation. To learn about the many other deployment options available, check the JBoss AS documentation bundled in the download. To look up an EJB, you need an InitialContext, which is your entry point for the JNDI registry. If you instantiate an InitialContext, Java automatically looks for the file jndi.properties on your classpath. You need to create this file in WORKDIR/ etc with settings that match the JBoss server s JNDI registry configuration:
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java.naming.factory.initial org.jnp.interfaces.LocalOnlyContextFactory java.naming.factory.url.pkgs org.jboss.naming:org.jnp.interfaces
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You don t need to know exactly what this configuration means, but it basically points your InitialContext to a JNDI registry running in the local virtual machine (remote EJB client calls would require a JNDI service that supports remote communication). By default, you look up the MessageHandler bean by the name of an implementation class, with the /local suffix for a local interface. How EJBs are named, how they re bound to JNDI, and how you look them up varies and can be customized. These are the defaults for the JBoss server. Finally, you call the MessageHandler EJB and let it do all the work automatically in two units each method call will result in a separate transaction.
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This completes our first example with managed EJB components and integrated JPA. You can probably already see how automatic transaction demarcation and EntityManager injection can improve the readability of your code. Later, we ll show you how stateful session beans can help you implement sophisticated conversations between the user and the application, with transactional semantics. Furthermore, the EJB components don t contain any unnecessary glue code or infrastructure methods, and they re fully reusable, portable, and executable in any EJB 3.0 container.
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Packaging of persistence units We didn t talk much about the packaging of persistence units you didn t need to package the Hello World example for any of the deployments. However, if you want to use features such as hot redeployment on a full application server, you need to package your application correctly. This includes the usual combination of JARs, WARs, EJB-JARs, and EARs. Deployment and packaging is often also vendor-specific, so you should consult the documentation of your application server for more information. JPA persistence units can be scoped to JARs, WARs, and EJB-JARs, which means that one or several of these archives contains all the annotated classes and a META-INF/persistence.xml configuration file with all settings for this particular unit. You can wrap one or several JARs, WARs, and EJB-JARs in a single enterprise application archive, an EAR. Your application server should correctly detect all persistence units and create the necessary factories automatically. With a unit name attribute on the @PersistenceContext annotation, you instruct the container to inject an EntityManager from a particular unit.
Full portability of an application isn t often a primary reason to use JPA or EJB 3.0. After all, you made a decision to use Hibernate as your JPA persistence provider. Let s look at how you can fall back and use a Hibernate native feature from time to time.
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