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if (SystemProperty.environment.value() ==   SystemProperty.Environment.Value.Production) {
// Load the class that provides the new "jdbc:google:mysql://" prefix.
 Class.forName("com.mysql.jdbc.GoogleDriver");
    url = "jdbc:google:mysql://my-project-id:my-instance-name/guestbook? user=root ";
} else {
// Local MySQL instance to use during development.
 Class.forName("com.mysql.jdbc.Driver");
 url = "jdbc:mysql://127.0.0.1:3306/guestbook?user=root password=xyz";
}
 }
} catch (Exception e) {
  e.printStackTrace();
  return;
}

PrintWriter out = resp.getWriter();
try {
  Connection conn = DriverManager.getConnection(url);
  try {
    String fname = req.getParameter("guestName");
    String content = req.getParameter("content");
    if (fname == "" || content == "") {
      out.println(
          "<html><head></head><body>You are missing either a message or a name! Try again! " +
          "Redirecting in 3 seconds...</body></html>");
    } else {
      String statement = "INSERT INTO entries (guestName, content) VALUES( ? , ? )";
      PreparedStatement stmt = conn.prepareStatement(statement);
      stmt.setString(1, fname);
      stmt.setString(2, content);
      int success = 2;
      success = stmt.executeUpdate();
      if (success == 1) {
        out.println(
            "<html><head></head><body>Success! Redirecting in 3 seconds...</body></html>");
      } else if (success == 0) {
        out.println(
            "<html><head></head><body>Failure! Please try again! " +
            "Redirecting in 3 seconds...</body></html>");
      }
    }
  } finally {
    conn.close();
  }
} catch (SQLException e) {
  e.printStackTrace();
}
resp.setHeader("Refresh", "3; url=/guestbook.jsp");

HTTP ERROR 500
Problem accessing /guestbook.jsp. Reason:
java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)
Caused by:javax.servlet.ServletException: java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)