老师，显示台没输出，一堆报错的， 我有按mysql8进行设置啊

1. package com.imooc.jdbc.demo1;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.sql.Statement;

import org.junit.Test;

public class JDBCDemo2 {

   @Test

   /*

    * 保存操作

    * */

   public void demo1() {

  Connection conn=null;

  Statement stmt =null;

  try {

  //注册驱动:

 Class.forName("com.mysql.cj.jdbc.Driver");

 conn = DriverManager.getConnection("jdbc:mysql://localhost:3306"+"?useSSL=false&serverTimezone=Hongkong&useUnicode=true&characterEncoding=utf-8","root","abc");

 //获得执行SQL语句的对象:

 stmt = conn.createStatement();

 //编写SQL

 String sql = "insert into user values(null,'eee','123','张三')";

 // 执行SQL:

int i =  stmt.executeUpdate(sql);

if (i>0) {

System.out.println("保存成功！");

}

  }catch(Exception e){

  e.printStackTrace();

  }finally {

  //释放资源

  if(stmt !=null) {

  try {

  stmt.close();

  }catch (SQLException e) {

  e.printStackTrace();

  }

  stmt=null;

  }

  if(conn !=null) {

  try {

  conn.close();

  }catch (SQLException e) {

  e.printStackTrace();

  }

  conn=null;

  }

  }

   }

}

java.lang.UnsupportedClassVersionError: com/imooc/jdbc/demo1/JDBCDemo2 has been compiled by a more recent version of the Java Runtime (class file version 56.0), this version of the Java Runtime only recognizes class file versions up to 52.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:763)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)

at java.net.URLClassLoader.access$100(URLClassLoader.java:73)

at java.net.URLClassLoader$1.run(URLClassLoader.java:368)

at java.net.URLClassLoader$1.run(URLClassLoader.java:362)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:361)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClass(RemoteTestRunner.java:780)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClasses(RemoteTestRunner.java:503)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:526)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:770)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)