JNDI

  Context env = 
    (Context) new InitialContext().lookup("java:comp/env");
  DataSource pool = (DataSource) env.lookup("jdbc/test");
  Connection conn = pool.getConnection();
  Statement stmt = conn.createStatement();
  ResultSet rs = stmt.executeQuery(
    "SELECT * FROM users where clue>0");
  while ( rs.next() ) {
    System.out.println(rs.getString("name"));
  }