JSPからaタグを使いServletに、画面遷移？させる方法について

###実現したいこと
JSPのaタグをつけServlet側に画面遷移する処理をしたいと考えているのですが、うまく画面遷移させることができません。
なにがたりないのでしょうか。
aのリンクをクリックすると404エラーが表示されます。

java
1package example;
2
3import java.io.IOException;
4
5import javax.servlet.RequestDispatcher;
6import javax.servlet.ServletException;
7import javax.servlet.annotation.WebServlet;
8import javax.servlet.http.HttpServlet;
9import javax.servlet.http.HttpServletRequest;
10import javax.servlet.http.HttpServletResponse;
11
12/**
13 * Servlet implementation class RegisterUser
14 */
15@WebServlet("/RegisterUser")
16public class RegisterUser extends HttpServlet {
17	private static final long serialVersionUID = 1L;
18
19    /**
20     * @see HttpServlet#HttpServlet()
21     */
22    public RegisterUser() {
23        super();
24    }
25
26	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
27
28		String forwardPath = null;
29		String action = request.getParameter("action");
30
31		if(action == null) {
32			forwardPath = "/action/WebContent/jsp/registerForm.jsp";
33		}
34
35		if(action != null && action.equals("done")) {
36
37
38			forwardPath = "/action/WebContent/jsp/registerDone.jsp";
39
40		}
41
42		RequestDispatcher dispatcher = request.getRequestDispatcher(forwardPath);
43		dispatcher.forward(request, response);
44
45
46
47	}
48
49
50
51
52	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
53		// TODO Auto-generated method stub
54		doGet(request, response);
55	}
56
57}
58

jsp
1<!--名前はtop.jsp-->
2<%@ page language="java" contentType="text/html; charset=UTF-8"
3    pageEncoding="UTF-8"%>
4<!DOCTYPE html>
5<html>
6<head>
7<meta charset="UTF-8">
8<title>Insert title here</title>
9</head>
10<body>
11
12  <a href="/action/example/RegisterUser">戻る</a>
13  <a href="/action/example/RegisterUser?action=done">登録する</a>
14
15</body>
16</html>

jsp
1<!-- registerDone.jsp-->
2<%@ page language="java" contentType="text/html; charset=UTF-8"
3    pageEncoding="UTF-8"%>
4<!DOCTYPE html>
5<html>
6<head>
7<meta charset="UTF-8">
8<title>Insert title here</title>
9</head>
10<body>
11<h1>アクションで値が渡せた</h1>
12</body>
13</html>

jsp
1<!--名前はregisterForm.jsp-->
2<%@ page language="java" contentType="text/html; charset=UTF-8"
3    pageEncoding="UTF-8"%>
4<!DOCTYPE html>
5<html>
6<head>
7<meta charset="UTF-8">
8<title>Insert title here</title>
9</head>
10<body>
11<h1>ここはミスページ</h1>
12</body>
13</html>