springboot链接mysql出错_springboot2.3.7连接mysql错误？

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我是靠谱客的博主冷傲秀发，最近开发中收集的这篇文章主要介绍springboot链接mysql出错_springboot2.3.7连接mysql错误？，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

问题描述

springboot 2.3.7

mysql-connector-java 8.0.22

mysql 8.0.3

openjdk 14.0.1 (尝试过 jdk 1.8)

在使用 springboot 2.2.2 版本时，没有任何问题，切换到 2.3.7版本报如下错误：02:54:54.036 logback [http-nio-8090-exec-1] DEBUG com.zaxxer.hikari.pool.PoolBase - HikariPool-1 - Failed to create/setup connection: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

02:54:54.038 logback [http-nio-8090-exec-1] DEBUG com.zaxxer.hikari.pool.HikariPool - HikariPool-1 - Cannot acquire connection from data source

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsExcepti