Could not initialize class com.imooc.mybatis.utils.MyBatisUtils

# 具体遇到的问题
ava.lang.NoClassDefFoundError: Could not initialize class com.imooc.mybatis.utils.MyBatisUtils

# 报错信息的截图
# 相关课程内容截图

# 尝试过的解决思路和结果
MyBatisUtils 静态库出错
# 粘贴全部相关代码，切记添加代码注释

package com.student.mybatis;

import com.student.mybatis.entity.Student;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

public class MyBatisTestor {
@Test
    public void testMyBatisSelectAll(){
        SqlSession sqlSession =null;
        try {
            sqlSession = com.imooc.mybatis.utils.MyBatisUtils.openSession();
            List<Student> list = sqlSession.selectList("student.selectAll");
            for (Student student:list){
                System.out.println(student);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            com.imooc.mybatis.utils.MyBatisUtils.closeSqlSession(sqlSession);
        }
    }
}

package com.imooc.mybatis.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.Reader;
//创建全局唯一的SqlSessionFactory对象
public class MyBatisUtils {
//利用静态属于类不属于对象，且全局唯一
    private  static SqlSessionFactory sqlSessionFactory = null;
    //利用静态块在初始化类时实例化SqlSessionFactory
    static {
//初始化静态对象
        try {
            Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("enter");
            throw new ExceptionInInitializerError(e);  //告诉调用者是初始化时出错
        }
    }
public static SqlSession openSession(){
return sqlSessionFactory.openSession();
    }
public static void closeSqlSession(SqlSession sqlSession){
if(sqlSession != null){
            sqlSession.close();
        }
    }
}

package com.student.mybatis.entity;

public class Student {
private  Integer id;
    private Integer regNo;
    private String  sex;
    private Integer age;
    private String grage;
    private String major;

    public Integer getId() {
return id;
    }

public void setId(Integer id) {
this.id = id;
    }

public Integer getRegNo() {
return regNo;
    }

public void setRegNo(Integer regNo) {
this.regNo = regNo;
    }

public String getSex() {
return sex;
    }

public void setSex(String sex) {
this.sex = sex;
    }

public Integer getAge() {
return age;
    }

public void setAge(Integer age) {
this.age = age;
    }

public String getGrage() {
return grage;
    }

public void setGrage(String grage) {
this.grage = grage;
    }

public String getMajor() {
return major;
    }

public void setMajor(String major) {
this.major = major;
    }

@Override
    public String toString() {
return "Student{" +
"id=" + id +
", regNo=" + regNo +
", sex='" + sex + '\'' +
", age=" + age +
", grage='" + grage + '\'' +
", major='" + major + '\'' +
'}';
    }
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--驼峰命名与自动命名转换 goods_id转换为 goodsId-->
    <settings>
        <setting name="mapUnderscoreToCameCase" value="true"/>
    </settings>
    <!--默认指向数据库-->
    <environments default="student">
        <environment id="dev">
            <!--采用JDBC方式对数据库事务进行commmit/rollback -->
            <transactionManager type="JDBC"></transactionManager>
            <!--采用连接池方式管理数据库连接 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/babytun?useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="12358"/>
            </dataSource>
        </environment>
        <environment id="student">
            <!--采用JDBC方式对数据库事务进行commmit/rollback -->
            <transactionManager type="JDBC"></transactionManager>
            <!--采用连接池方式管理数据库连接 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/studb?useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="12358"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="mappers/student.xml"/>
    </mappers>
</configuration>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="student">
    <!--select id查询别名 resultType返回结果-->
    <select id="selectAll" resultType="com.student.mybatis.entity.Student">
          select * from student
</select>
</mapper>

package com.imooc.mybatis.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.Reader;
//创建全局唯一的SqlSessionFactory对象
public class MyBatisUtils {
//利用静态属于类不属于对象，且全局唯一
    private  static SqlSessionFactory sqlSessionFactory = null;
    //利用静态块在初始化类时实例化SqlSessionFactory
    static {
//初始化静态对象
        try {
            Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("enter");
            throw new ExceptionInInitializerError(e);  //告诉调用者是初始化时出错
        }
    }
public static SqlSession openSession(){
return sqlSessionFactory.openSession();
    }
public static void closeSqlSession(SqlSession sqlSession){
if(sqlSession != null){
            sqlSession.close();
        }
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <repositories>
        <repository>
            <id>aliyun</id>
            <name>aliyun</name>
            <url>https://maven.aliyun.com/repository/central</url>
        </repository>
    </repositories>
    <groupId>StudentMybatis</groupId>
    <artifactId>com.student.mybatis</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>

</project>