For quick testing,
@Resource(lookup="jdbc/sqlserver")
private DataSource ds;
assuming jdbc/sqlserver is the name of the datasource that you created in GF.
For more flexible and portable app,
@Resource(lookup="java:comp/env/jdbc/sqlserver")
private DataSource ds;
IF:
(1) jdbc/sqlserver is the name of the datasource that you created in GF
(2) you declared a resource-ref in web.xml, whose res-ref-name is jdbc/sqlserver
(3) you also have a sun-web.xml containing a <resource-ref> element to map the res-ref-name in (2) to the jndi-name (jdbc/sqlserver) in (1)
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