12.3. Resource References

The resource references are another examples of environment entries. For such entries, using subcontexts is recommended:

• java:comp/env/jdbc for references to DataSources objects.

• java:comp/env/jms for references to JMS connection factories.

In the standard deployment descriptor, the declaration of a resource reference to a JDBC connection factory is:

<resource-ref>
  <res-ref-name>jdbc/AccountExplDs</res-ref-name>
  <res-type>javax.sql.DataSource</res-type>
  <res-auth>Container</res-auth>
</resource-ref>

And the bean accesses the datasource as in the following:

InitialContext ictx = new InitialContext();
DataSource ds = ictx.lookup("java:comp/env/jdbc/AccountExplDs");

Binding of the resource references to the actual resource manager connection factories that are configured in the EJB server is done in the JOnAS-specific deployment descriptor using the jonas-resource element.

<jonas-resource>
  <res-ref-name>jdbc/AccountExplDs</res-ref-name>
  <jndi-name>jdbc_1</jndi-name>
</jonas-resource>