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@Resource(name="myDerbyDatabase", type="javax.sql.DataSource".class)
@Stateless
public class FooBean {

    public void setSessionContext(SessionContext sessionContext) {
        DataSource dataSource = (DataSource) sessionContext.lookup("myDerbyDatabase");
    }

    public void someOtherMethod() throws Exception {
        InitialContext initialContext = new InitialContext();
        DataSource dataSource = (DataSource) initialContext.lookup("java:comp/env/myDerbyDatabase");
    }
}