报错

项目一开始本地测试使用的 mysql 5.7，想调整为 8.0。

启动报错:

java.sql.SQLException: Unable to load authentication plugin 'caching_sha2_password'.
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:868)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:864)
	at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1746)
	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1226)
	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2191)
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2222)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2017)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:779)
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:156)
	at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1572)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1636)
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2505)
Sun Aug 27 15:43:26 CST 2023 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.

原因

由于我安装的mysql 8.0，8.0和5.x其中一个改动就是加密认证方式发生改变：

caching_sha2_password是8.0

mysql_native_password是5.x

解决方案

更改mysql的jdbc版本

直接在xx.pom修改版本号即可。

mysql jdbc的maven链接：http://mvnrepository.com/artifact/mysql/mysql-connector-java

比如：

<mysql-connector.version>8.0.33</mysql-connector.version>

参考资料

https://blog.csdn.net/qq_33589510/article/details/132524356