jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection 问题

具体描述 nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Unknown initial character set index ‘255’ received from server. Initial client character set can be forced via the ‘characterEncoding’ property.)

首先，确定你的mysql版本，8及以上的话：

url=jdbc:mysql://localhost:3306/数据库名?useSSL=false&serverTimezone=CTT

driverClass=com.mysql.cj.jdbc.Driver

然后，将maven pom 文件里的依赖改为：

mysql

mysql-connector-java

runtime

8.0.13