Help with oracle 10g with servlet

Question

Someone please help me with this error when i compile this:
import java.io.*;
import java.net.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.servlet.*;
import javax.servlet.http.*;
* @author GeorgeZheng
* @version
public class MyServlet2 extends HttpServlet {
/** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, SQLException, ClassNotFoundException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
doPost(request,response);
out.close();
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
processRequest(request, response);
} catch (SQLException ex) {
throw new ServletException(ex);
catch (ClassNotFoundException ex) {
throw new ServletException(ex);
/** Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
processRequest(request, response);
String username = request.getAttribute("username").toString();
String password = request.getAttribute("password").toString();
if(validateUser(username, password))
response.sendRedirect("SQL.html");
else
response.sendRedirect("input.jsp");
} catch (SQLException ex) {
throw new ServletException(ex);
catch (ClassNotFoundException ex) {
throw new ServletException(ex);
/** Returns a short description of the servlet.
public String getServletInfo() {
return "Short description";
public boolean validateUser(String user, String pass)
throws IOException, ServletException{
int checker = 0;
boolean test = false;
try
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE","hr", "123456kk");
System.out.println("database connected");
Statement sqlStatement = conn.createStatement();
ResultSet rs = sqlStatement.executeQuery("select * from log");
while(rs.next())
if(rs.getString(1) == user)
checker++;
if(rs.getString(2) == pass)
checker++;
conn.close();
return test;
catch (SQLException e)
throw new ServletException("Servlet cannot display the records", e);}
catch (ClassNotFoundException e)
throw new ServletException("JDBC Driver not found.", e);
it gave me this error:
Deploying application in domain failed; Error loading deployment descriptors for practiced Line 12 Column 48 -- Duplicate unique value [MyServlet2] declared for identity constraint of element "web-app".
; requested operation cannot be completed
C:\Documents and Settings\GeorgeZheng\practiced\nbproject\build-impl.xml:452: Deployment error:
The module has not been deployed.
See the server log for details.

Answer 1

I would guess that your problems has to do with your web.xml file.
MeTitus