New to Java

Case 1, for a NON-JNDI based database connection:

Connection conn = DriverManager.getConnection(url, "username", "password");


Case 2, for a JNDI based database connection:

Context context = new InitialContext();
DataSource dataSource = (DataSource) context.lookup("java:comp/env/jdbc/test");
Connection conn = dataSource.getConnection();

Notice that for NON-JNDI based database connection, the username and password are specified. But for the
JNDI based database connection, there is no username and password specified. How come? If I want to specify the username and password for JNDI based connection, how can I do it?


Thanks

Scott