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Editorial Team
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Asked: 2026-05-26T21:47:51+00:00

I am preparing a J2EE web application that should hopefully be packaged and sold

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I am preparing a J2EE web application that should hopefully be packaged and sold to clients as a war file. Each client will deploy the package into his preferred application server and will use the app with his preferred Data Source.

I am wondering what’s the best portable way to define the necessary mappings to the Data Source.

The application uses the EclipseLink JPA Persistence Provider. The entry point is something like:

@PersistenceContext(unitName = "myPersistenceUnit")
private EntityManager em;

myPersistenceUnit is described in persistence.xml as follows:

  <persistence-unit name="myPersistenceUnit" transaction-type="JTA">
    <jta-data-source>myDataSource</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties/>
  </persistence-unit>

Now my guess is that I need to map myDataSource to the application server JNDI resource name somehow, but I am lost on how to do it. If I use the code auto-generated by NetBeans on GlassFish server, it creates the glassfish-resources.xml descriptor for the purpose. This approach works, but isn’t portable to other App Servers and produces a duplication of the Connection Pool’s properties (that are already defined in the Application Server).

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1 Answer

  1. Editorial Team

    Use relative JNDI mappings and link them in your web.xml.

    You have to create a resource-ref entry in your web.xml.

    Depending on application server the resource-ref entry in the web.xml will do. Others may require additional files.

    Check the examples here for the web.xml part.

    http://download.oracle.com/docs/cd/E12840_01/wls/docs103/webapp/configureresources.html
    http://wiki.eclipse.org/Jetty/Howto/Configure_JNDI_Datasource
    http://tomcat.apache.org/tomcat-7.0-doc/jndi-datasource-examples-howto.html

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