servlet项目启动报404怎么解决

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使用的是注释,metadata-complete="true"，下面是web.xml


  web

index.html
index.htm
index.jsp
default.html
default.htm
default.jsp


写个打印语句也报404

package com.it66.session;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class SessionServlet
*/
@WebServlet("/SessionServlet")
public class SessionServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("SessionServlet");
}}
求大佬帮解决

JAVA

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