syntax error on jsp update validation code

After feeling the update database table form and submitting it I get this error:

You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '?, user_surname=?, email=?, phone_number=?, password=?, confirm_password=? wh...' at line 1. I am using JSP on Apache Netbeans 12.6, Here is my whole validation code.

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<%@page import="java.sql.*,java.util.*" %>


<% Class.forName("com.mysql.cj.jdbc.Driver"); %>
<%
 
   String user_role=request.getParameter("user_role"); 
   String user_name=request.getParameter("user_name");
   String user_surname=request.getParameter("user_surname"); 
   String email=request.getParameter("email"); 
   String phone_number=request.getParameter("phone_number"); 
   String password=request.getParameter("password"); 
   String confirm_password=request.getParameter("confirm_password"); 
   Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/simsdb","root","");
   Statement st=con.createStatement();
   int i=st.executeUpdate("update users set user_role=?, user_surname=?, email=?, phone_number=?, password=?, confirm_password=? where user_name=?");
   out.println("Updated");
   out.print("<br><a href=\"usermngt.jsp\"><button type=\"button\">User Management</button></a>");
%>

I have tried many update validation codes but they just don't update anything at all. As for this code it worked on Delete and Insert so I believe it should work on update also.