JDBC连接异常_exception during pool initialization

报了多个异常，没给原因，就是提示jdbc连接不上

Exception during pool initialization.

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.

Caused by: javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)

Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection;

解决方案：

在url携带参数后面添加：createDatabaseIfNotExist=true&useSSL=false

原理暂时不懂，待更新