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Article donated by: Henry Isidro, Leonard Flournoy, Hernan Cunico

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EJB implementation may vary from one vendor to another. The purpose of this section is to provide a session bean specific feature-to-feature comparison between JBoss and Apache Geronimo so you can clearly identify the differences and plan accordingly before migration.

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Sample application

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sampleApp sampleApp

This sample application Session Bean Sample Application shows how session beans are used and deployed in a container. There are two clients, one for stateless session beans and another for stateful session beans. Both client applications use the same database which contains a table that stores loan application details. An entity bean is used to connect to and operate on the loan details table. A session bean is then used by the client application to get specific details from the database using the entity bean. The first client creates a stateless session bean and displays a list of denied loan applications via a method defined in that EJB. The second client creates a stateful session bean and adds loan applications to the database.

The following figure illustrates the application flow:

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Application Beans

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Download the Session Bean sample application from the following URL:link:

Session Bean Samplehttp://opensource2.atlassian.com/confluence/oss/download/attachments/1155/session.zip

After extracting the zip file, a session directory will be created. From now on, this directory will be referred as <session_home>.

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This will compile the source files and package the EJB jar file. You can see the results in the <session_home>/target directory. The following list shows the dependency jars needed in building and running the Session Bean sample application.

• geronimo-spec-ejb-_2.1_spec-rc41.0.jar - the EJB spec; needed for compiling source.
• openejb-core-2.0-G1M5.jar - needed by Geronimo during runtime.
• geronimo-spec-j2ee-_1.4_spec-rc41.0.jar - needed by Geronimo during runtime.
• geronimo-security-1.0-M5.jar - needed by Geronimo during runtime.

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The following figures illustrate the home page for the Web Application as well as the testing for the stateless and stateful beans depending on your selection on the Web Application home page.

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The Geronimo environment

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Geronimo Geronimo

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CREATE TABLE CUSTOMER(ID INTEGER NOT NULL PRIMARY KEY,NAME VARCHAR(45),BIRTHDATE DATE,SSS_NO VARCHAR(25),ADDRESS VARCHAR(60),ANNUAL_SALARY DOUBLE,LOAN_AMOUNT DOUBLE)

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Step-by-step migration

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migration migration

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<openejb-jar
    xmlns="http://www.openejb.org/xml/ns/openejb-jar"
    xmlns:naming="http://geronimo.apache.org/xml/ns/naming"
    xmlns:security="http://geronimo.apache.org/xml/ns/security"
    xmlns:sys="http://geronimo.apache.org/xml/ns/deployment"
    configId="geronimo/SessionBeanDemo/1.0/car"
    parentId="orggeronimo/apache/geronimo/Serverj2ee-server/1.0/car">
 <enterprise-beans>
 	
    <entity>
        <ejb-name>CustomerEJB</ejb-name>
        <jndi-name>CustomerHomeRemote</jndi-name>
        <local-jndi-name></local-jndi-name>
        <resource-ref>
            <ref-name>jdbc/ibm-demo</ref-name>
            <resource-link>SystemDatasource</resource-link>
        </resource-ref>
    </entity>
    
    <session>
        <ejb-name>LoanManagerEJB</ejb-name>
        <jndi-name>LoanManagerHomeRemote</jndi-name>
        <ejb-ref>
            <ref-name>ejb/CustomerHomeRemote</ref-name>
            <ejb-link>CustomerEJB</ejb-link>
        </ejb-ref>        
   </session>
 	
 	<session>
        <ejb-name>StatefulLoanManagerEJB</ejb-name>
        <jndi-name>StatefulLoanManagerHomeRemote</jndi-name>
        <ejb-ref>
            <ref-name>ejb/CustomerHomeRemote</ref-name>
            <ejb-link>CustomerEJB</ejb-link>
        </ejb-ref>        
   </session>
   
 </enterprise-beans>
    
</openejb-jar>

As with all Geronimo deployment plans, this configuration requires a parent configuration. In this case, it is orggeronimo/apache/geronimo/Serverj2ee-server/1.0/car, then follows the definition of the EJBs.

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As with JBoss, the following figures illustrate the home page for the Web Application as well as the testing for the stateless and stateful beans depending on your selection on the Web Application home page.

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Summary

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summary summary

This article has shown how to migrate a sample application that uses Session Beans, from JBoss v4.0.2 to Apache Geronimo M5. This article provided step-by-step instructions to build the application, deploy and run it, and then migrate it to the Geronimo environment.

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