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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

4. Under the graph, right-click Counter, and then click Add Counters. Windows XP Professional displays the Add Counters dialog box. 5. Which performance object and counter are selected by default

6. In the Select Counters From list, select Interrupts/Sec, and then click Explain. Windows XP Professional displays an Explain Text dialog box indicating that Interrupts/Sec is the average number of hardware interrupts that the processor receives and services each second. 7. Close the Explain Text window. 8. Click Add to add the Interrupts/Sec counter to the Processor object. 9. In the Performance Object list box, select Paging File. 10. Under Select Counters From List, ensure that %Usage is selected, and then click Add to add the Paging File object with the %Usage counter. 11. Close the Add Counters dialog box. 12. Press Ctrl+B to view a histogram. 13. Press Ctrl+R to view a report. 14. Press Ctrl+G to return to a graph. 15. Close the Performance console.

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(); } }

Using the Performance Console 19-23

Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you have difficulty answering these questions, review the material in this lesson before beginning the next lesson. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. Which of the following monitoring tools are included in the Performance console (Choose all answers that are correct.) a. System Monitor snap-in b. Task Manager snap-in c. Performance Logs And Alerts snap-in d. Task Scheduler 2. Why should you monitor resources and overall system performance

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:

Hand off control of the project to the Operate team. Perform one or more pilot deployments. Submit the build and testing reports for a release readiness review by the management team.

4. Why do you need to determine a baseline when you monitor system resources and system performance

The Performance console contains the System Monitor snap-in and the Performance Logs And Alerts snap-in. The System Monitor snap-in allows you to monitor the performance of your computer or other computers on the network.

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.