java.lang.ClassNotFoundException: fastjson2.modules.ObjectReaderModule

问题遇到的现象和发生背景使用阿里的fastjson2的jar包写小项目学习的时候出现错误（jar是最新的fastjson-2.0.10.graal.jar）

问题相关代码，请勿粘贴截图这是前端代码

html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
head>

<script>
    window.onload = function () {
        document.getElementById("btn").onclick = function () {
            var xhr = new XMLHttpRequest();
            xhr.onreadystatechange = function () {
                if (this.readyState == 4){
                    if (this.status == 200){
                        var stuList = JSON.parse(this.responseText)
                        var html = ""
                        for (var i = 0;i< stuList.length;i++){
                            var stu = stuList[i]
                            html += ""
                            html += ""+(i+1)+""
                            html += ""+stu.name+""
                            html += ""+stu.age+""
                            html += ""+stu.addr+""
                            html += ""
                        }
                        document.getElementById("stutbody").innerHTML=html;
                    }else {
                        alert(this.status)
                    }
                }
            }
            xhr.open("GET" , "/ajax1/Ajax01Servlet?t=" + new Date().getTime(), true);
            xhr.send()
        }

    }

script>
<body>

<input type="button" value="显示学员列表" id="btn">
<table border="1px" width=""50%>
    <thead>
    <tr>
        <th>编号th>
        <th>名字th>
        <th>年龄th>
        <th>住址th>
    tr>
    thead>
    <tbody id="stutbody">
    
    tbody>
table>
body>
html>

后端代码如下：

import bean.Student;
import com.alibaba.fastjson.JSON;

import javax.servlet.annotation.WebServlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;

@WebServlet("/Ajax01Servlet")
public class Ajax01Servlet extends javax.servlet.http.HttpServlet {
    @Override
    protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {

    }

    protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        Connection conn = null;
        PreparedStatement ps = null;
        ResultSet rs= null;
        StringBuilder json = new StringBuilder();
        String jsonStr = "";
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql:///abc123?serverTimezone=UTC&useUnicode= true &characterEncoding=utf-8", "root", "123456");
            String sql = "select name,age,addr from t_student";
            ps = conn.prepareStatement(sql);
            rs = ps.executeQuery();
            /*json.append("[");
            while (rs.next()) {
                //获取每个学生的信息
                String name = rs.getString("name");
                String age = rs.getString("age");
                String addr = rs.getString("addr");
                //拼接json格式的字符串
                json.append("{\"name\":\"");
                json.append(name);
                json.append("\",\"age\":");
                json.append(age);
                json.append(",\"addr\":\"");
                json.append(addr);
                json.append("\"},");
            }
            jsonStr = json.substring(0,json.length()-1) +"]";*/
            List studentList = new ArrayList<>();
            while (rs.next()) {
                //获取每个学生的信息
                String name = rs.getString("name");
                int age = rs.getInt("age");
                String addr = rs.getString("addr");
                Student s = new Student(name,age,addr);
                studentList.add(s);

            }
            jsonStr = JSON.toJSONString(studentList);

        } catch (Exception  e) {
            e.printStackTrace();
        }finally {
            if (rs != null){
                try {
                    rs.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (ps != null){
                try {
                    ps.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (conn != null){
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
        out.print(jsonStr);
    }
}

运行结果及报错内容

25-Jul-2022 22:04:50.889 严重 [http-nio-8080-exec-1] org.apache.catalina.core.StandardWrapperValve.invoke 在路径为的上下文中，Servlet[Ajax01Servlet]的Servlet.service（）引发了具有根本原因的异常Servlet执行抛出一个异常
    java.lang.ClassNotFoundException: com.alibaba.fastjson2.modules.ObjectReaderModule
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at Ajax01Servlet.doGet(Ajax01Servlet.java:58)_**//该行高亮提醒**_
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:367)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:639)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:882)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1647)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
25-Jul-2022 22:04:50.902 严重 [http-nio-8080-exec-2] org.apache.catalina.core.StandardWrapperValve.invoke 在路径为的上下文中，Servlet[Ajax01Servlet]的Servlet.service（）引发了具有根本原因的异常Servlet执行抛出一个异常
    java.lang.ClassNotFoundException: com.alibaba.fastjson2.modules.ObjectReaderModule
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at Ajax01Servlet.doGet(Ajax01Servlet.java:58)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:367)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:639)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:882)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1647)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
25-Jul-2022 22:04:51.018 严重 [http-nio-8080-exec-3] org.apache.catalina.core.StandardWrapperValve.invoke 在路径为的上下文中，Servlet[Ajax01Servlet]的Servlet.service（）引发了具有根本原因的异常Servlet执行抛出一个异常
    java.lang.ClassNotFoundException: com.alibaba.fastjson2.modules.ObjectReaderModule
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at Ajax01Servlet.doGet(Ajax01Servlet.java:58)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:367)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:639)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:882)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1647)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
        at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)

我的解答思路和尝试过的方法

java.lang.ClassNotFoundException: com.alibaba.fastjson2.modules.ObjectReaderModule我看这一行说模块好像是未引入，但是我的modules也有引入了fastjson2

我想要达到的结果

有没有大神帮帮忙，找了一天了

我也是这样，我换了个1.2的jar包就好了

重新引入一下jar包，将pom文件剪切再粘贴回来，找一下对应的仓库中有没有这个jar包

换了1.2.79就解决了，大无语