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Exploring Geronimo's GBean Framework : Page 3

Apache Geronimo is a general runtime execution environment and certified J2EE application server that you can configure to satisfy many different infrastructure requirements.


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An Example GBean
A GBean is a simple Java class that is extended to implement the org.apache.geronimo.gbean.GBeanLifecycle interface and to define attributes, references, and operations via a public static method with the signature, GBeanInfo getGBeanInfo. A GBean should, by convention, also create an instance of GBeanInfo in a static initializer block and expose this instance as a public static final field called GBEAN_INFO.

According to these rules, a very simple GBean would look similar to the class shown in Listing 1.

Integrating a GBean into Geronimo
With the GBean class defined, you must compile and encapsulate it within an archive file (.ear, .war, .jar, etc.). The archive must contain the deployment plan for the GBean, and that plan must conform one of the deployment schemas found in the /schema directory. This example deploys the TestGBean as a standalone module; therefore it must conform to the geronimo-module-1.x.xsd schema.

Here's a simple standalone module plan for the TestGBean shown in Listing 1:

<?xml version="1.0" encoding="UTF-8"?> <module xmlns="http://geronimo.apache.org/xml/ns/deployment-1.1"> <environment> <moduleId> <groupId>com.example.gbeans</groupId> <artifactId>TestGBean</artifactId> <version>1.1</version> </moduleId> </environment> <gbean name="TestGBean" class="com.example.TestGBean"> <attribute name="message">buenos dias</attribute> </gbean> </module>

Now that the plan is in place, use the jar command-line tool to create a jar file for TestGBean, as follows:

$ jar -Mcvf mygbean.jar com/example/*.class

After creating the .jar file, start the Geronimo server by executing the startup script you'll find in /bin. The Geronimo startup console will appear and when the server is ready, you should see output similar to the following:



Startup completed in 27 seconds Listening on Ports: 1099 0.0.0.0 RMI Naming 1527 0.0.0.0 Derby Connector 4201 0.0.0.0 ActiveIO Connector EJB 4242 0.0.0.0 Remote Login Listener 8080 0.0.0.0 Jetty Connector HTTP 8443 0.0.0.0 Jetty Connector HTTPS 9999 0.0.0.0 JMX Remoting Connector 61613 0.0.0.0 ActiveMQ Transport Connector 61616 0.0.0.0 ActiveMQ Transport Connector Started Application Modules: EAR: org.apache.geronimo.configs/webconsole-jetty6/2.0-M1/car RAR: org.apache.geronimo.configs/activemq/2.0-M1/car RAR: org.apache.geronimo.configs/system-database/2.0-M1/car WAR: org.apache.geronimo.configs/dojo-jetty6/2.0-M1/car WAR: org.apache.geronimo.configs/remote-deploy-jetty/ 2.0-M1/car WAR: org.apache.geronimo.configs/welcome-jetty/2.0-M1/car Web Applications: http://localhost:8080/ http://localhost:8080/console http://localhost:8080/console-standard http://localhost:8080/dojo http://localhost:8080/remote-deploy

At this point, you're ready to deploy your GBean to Geronimo.



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