The sun-*.xml jndi-name mappings do not declare a dependency. They just map an existing
dependency to a global resource. The sun-web.xml resource-ref mapping serves
the same purpose as the mappedName attribute of the @Resource annotation. Either way,
you still need to declare the dependency in the first place. That can be done either
via a standard deployment descriptor, which in this case would be web.xml, or via the
@Resource annotation. In web.xml it would look like this :
<resource-ref>
<res-ref-name>jdbc/edm</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>
We have a presentation that explains some of this material in more detail here :
https://glassfish.dev.java.net/javaee5/ejb/compdependencies_xmlforum_nov15.pdf
--ken
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