出现了initializationError

package com.imooc.jdbc.demo1;


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import org.junit.Test;

//import com.mysql.jdbc.Connection;
//import com.mysql.jdbc.Statement;
import com.mysql.jdbc.Driver;


public class JDBCDemo1 {
	
	@Test
	public void demo1() {
		try {
			DriverManager.registerDriver(new Driver());
			Connection conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/jdbctest" , "root", "307715");
			String sql = "select * from user";
			Statement stmt = (Statement) conn.createStatement();
			ResultSet resultSet = stmt.executeQuery(sql);
			while(resultSet.next()) {
				int uid = resultSet.getInt("uid");
				String username = resultSet.getString("username");
				String password = resultSet.getString("password");
				String name = resultSet.getString("name");
				System.out.println(uid + " " + username+ " " + password+ " " + name);
			resultSet.close();
			stmt.close();
			conn.close();
			}
		} catch(SQLException e){
			e.printStackTrace();
		}
	}
}

点击运行：

我系统是macOS 10.12，mysql是5.7.20