hi


import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ConnectionDatabase extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
Connection conn = null;
String url = "jdbc:mysql://localhost:3306/";;
String dbName = "register";
String driver = "com.mysql.jdbc.Driver";
String userName = "root";
String password = "root";
try{
Class.forName(driver).newInstance();
conn = DriverManager.getConnection(url+dbName,userName,password);
out.println("Successfully connect to the database");
conn.close();

}
catch (Exception e) {
e.printStackTrace();
}

}
}

Did you properly mentioned the servlet mapping in web.xml???? Check your web.xml file once... And if possible post your web.xml file