运行失败：Error during artifact deployment. See server log for details.

老师您好，我在写好代码后进行运行，控制台中出现了如下提示：

我的项目结构：

相关代码：News实体类

package com.lin.ajax.entity;

public class News {
    private String title;
    private String date;
    private String sourse;
    private String content;

    public News(String title, String date, String sourse, String content) {
        this.title = title;
        this.date = date;
        this.sourse = sourse;
        this.content = content;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getSourse() {
        return sourse;
    }

    public void setSourse(String sourse) {
        this.sourse = sourse;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
}

相关代码：

NewsServlet类

package com.lin.ajax.servlet;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.lin.ajax.entity.News;

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

@WebServlet("/news")
public class NewsServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<News> list=new ArrayList<>();
        list.add(new News("TIOBE:2018年编程语言排行趋势","2018-5-1","TIOBE","......"));
        list.add(new News("TIOBE:2019年编程语言排行趋势","2018-5-1","TIOBE","......"));
        list.add(new News("TIOBE:2020年编程语言排行趋势","2018-5-1","TIOBE","......"));
        list.add(new News("TIOBE:2012年编程语言排行趋势","2018-5-1","TIOBE","......"));
        //这个类是由Json提供的，用来将对象转为Json字符串的
        ObjectMapper objectMapper=new ObjectMapper();
        String json=objectMapper.writeValueAsString(list);
        response.setContentType("text/json;charset=utf-8");
        response.getWriter().println(json);
    }
}