Jsp doesn't connect to the servlet

Question

I'm getting the error 404 not found When I'm trying to call a new Servlet.

I've already set up the urlPatterns at the servlet and I'm linking the JSP file correctly, I think. Look below the archives.

Servlet:

package controller;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import dao.DAOFactory;
import dao.DiagnosisDAO;
import model.Category;
import model.Diagnosis;

/**
 * Servlet implementation class DiagnosisController
 */
@MultipartConfig
@WebServlet(name = "/DiagnosisController", urlPatterns = {
        "/diagnosis",
        "/diagnosis/all"
})

public class DiagnosisController extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public DiagnosisController() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        RequestDispatcher dispatcher;


        switch(request.getServletPath()) {
        case "/diagnosis":
            DiagnosisDAO diagDao;
            try(DAOFactory daoFactory = new DAOFactory()){
                diagDao = daoFactory.getDiagnosisDAO();

                Diagnosis diag = diagDao.get_DMFSteam();
                request.setAttribute("DSteam", diag.getDMFSteamList());

            } catch (ClassNotFoundException e1) {
                request.getSession().setAttribute("error", e1.getMessage());
            } catch (SQLException e1) {
                request.getSession().setAttribute("error", e1.getMessage());
            } catch (Exception e1) {
                request.getSession().setAttribute("error", e1.getMessage());
            }
            dispatcher = request.getRequestDispatcher("/view/diagnosis/charts.jsp");
            dispatcher.forward(request, response);
            break;
        }
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub



        doGet(request, response);
    }

}

And this is the JSP:

<%-- 
    Document   : navbar
    Created on : 03/07/2018, 11:55:04
    Author     : dskaster
--%>

<%@page contentType="text/html" pageEncoding="UTF-8" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<div class="navbar navbar-default navbar-fixed-top">
    <div class="container">
        <div class="navbar-header">
            <button class="navbar-toggle" type="button" data-toggle="collapse" data-target=".navbar-collapse">
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <span class="navbar-brand"><a href="${pageContext.servletContext.contextPath}/view/menuInicial.jsp">Banco de Dados</a></span>
        </div>
        <div class="navbar-collapse collapse">

                <ul class="nav navbar-nav">
                    <li>
                        <a href="${pageContext.servletContext.contextPath}/view/menuInicial.jsp">Home</a>
                    </li>

                    <li class="dropdown">
                        <a class="dropdown-toggle" href="javascript:void(0)" data-toggle="dropdown">
                            Jogos<span class="caret"></span>
                        </a>
                        <ul class="dropdown-menu">
                            <li><a href="${pageContext.servletContext.contextPath}/game">Listar jogos</a></li>
                            <li><a href="${pageContext.servletContext.contextPath}/game/create/first">Cadastrar jogo</a></li>
                        </ul>
                    </li>

                    <li>
                        <a href="${pageContext.servletContext.contextPath}/developer">Desenvolvedoras</a>
                    </li>

                    <li>
                        <a href="${pageContext.servletContext.contextPath}/publisher">Publicadoras</a>
                    </li>

                    <li>
                        <a href="${pageContext.servletContext.contextPath}/view/category/create.jsp">Nova Categoria</a>
                    </li>

                    <li>
                        <a href="${pageContext.servletContext.contextPath}/view/json/import.jsp">Upload Json</a>
                    </li>

                    <li>
                        <a class="btn btn-lg btn-warning" href="${pageContext.servletContext.contextPath}/diagnosis/all">Diagnósticos</a>
                    </li>
                </ul>


        </div>
    </div>
</div>

The last "li" of the JSP file is "href="${pageContext.servletContext.contextPath}/diagnosis/all", that should call the Servlet above, but doesn't work. I've already tried to create a new Controller but still doesn't work.

I really need help with this issue, It has been a lot of time with this error and I'm giving up of this project.

I'm using the Eclipse IDE Photon with apache tomcat 8.0 and 9.0.

I've tried both, but none worked. It may be a Tomcat problem? — Guilherme Mello, Nov 10 '18 at 01:21
debug at line switch, try to print something to make sure expression language is working, can you provide project structure as screen shot may be — shareef, Nov 10 '18 at 15:56
I found the error, that was at the Servlet, in "@MultipartConfig". I've removed it, and works. Thank you all! — Guilherme Mello, Nov 19 '18 at 19:58

score 0 · Accepted Answer · answered Nov 19 '18 at 20:02

I found the error, that was at the Servlet, I've removed the tag "@MultipartConfig", and all works. The Servlet is like that:

package controller;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import dao.DAOFactory;
import dao.DiagnosisDAO;
import model.Category;
import model.Diagnosis;

/**
 * Servlet implementation class DiagnosisController
 */

@WebServlet(name = "/DiagnosisController", urlPatterns = {
        "/diagnosis",
        "/diagnosis/all"
})

public class DiagnosisController extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public DiagnosisController() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        RequestDispatcher dispatcher;


        switch(request.getServletPath()) {
        case "/diagnosis":
            DiagnosisDAO diagDao;
            try(DAOFactory daoFactory = new DAOFactory()){
                diagDao = daoFactory.getDiagnosisDAO();

                Diagnosis diag = diagDao.get_DMFSteam();
                request.setAttribute("DSteam", diag.getDMFSteamList());

            } catch (ClassNotFoundException e1) {
                request.getSession().setAttribute("error", e1.getMessage());
            } catch (SQLException e1) {
                request.getSession().setAttribute("error", e1.getMessage());
            } catch (Exception e1) {
                request.getSession().setAttribute("error", e1.getMessage());
            }
            dispatcher = request.getRequestDispatcher("/view/diagnosis/charts.jsp");
            dispatcher.forward(request, response);
            break;
        }
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub



        doGet(request, response);
    }

}

Thank you guys.

Jsp doesn't connect to the servlet

1 Answers1