Resource factory references

A resource factory is an object that you use to create resources. You can assign a logical name to a resource factory in the deployment descriptor.

A resource-ref element defines a single resource factory reference. This code sample defines a reference to the resource factory that implements the DataSource interface:

<resource-ref>
   <description>
      Data source for the database in which the Employee
      enterprise bean records transactions
   </description>
   <res-ref-name>jdbc/EmployeeAppDB</res-ref-name>
   <res-type>javax.sql.DataSource</res-type>
   <res-auth>Container</res-auth>
</resource-ref>

A resource-ref element contains:

This code sample obtains a reference to the resource factory that implements the DataSource interface, and uses that reference to get a database connection (resource):

// Obtain the initial JNDI context
Context initContext = new InitialContext();

// Look up the resource factory using JNDI
javax.sql.DataSource ds = (javax.sql.DataSource)
   initContext.lookup
     (“java:comp/env/jdbc/EmployeeAppDB”);

// Get a database connection
java.sql.Connection connection = ds.getConnection();