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mysql 错 Could not open JDBC Connection for transaction; nested exception is java.sql.SQLExceptio

本文转载自  查看原文  2021-06-14 01:29  5814    Java_Web

我的报错的原因是数据库连接失败。

（一般项目等好长时间才报错就是没连上数据库，因为没连上数据库需要等几秒才会报错

 

1、检查用户名密码错误没（很少人犯这种错误

2、数据库依赖的jar包，现在好多人看视频学习，其实有的jar包更新好快，用之前的jar包不能连接现在高版本数据库（我就是这个原因

<dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.15</version>
            </dependency>

 

看一下自己mysql数据库版本，上网找一下对应的jar包

 


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