报错Class not found com.imooc.jdbc.demo1.JDBCDemo2

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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");
			// 获得连接
			conn = DriverManager.getConnection(
					"jdbc:mysql:///jdbctest"
							+ "?useSSL=false&serverTimezone=Hongkong&useUnicode=true&characterEncoding=utf-8",
					"root", "1234");
			// 获得执行SQL语句的对象：
			stmt = conn.createStatement();
			// 编写SQL
			String sql = "insert user values(null,'eee','123','张三')";
			// 执行SQL
			int i = stmt.executeUpdate(sql);
			// 大于0说明影响成功
			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;
			}
		}
	}
}