SpringBoot启动报错：Exception during pool initialization

SpringBoot启动报错：HikariPool-1 - Exception during pool initialization.

2019-03-20 17:30:16.264 INFO 15528 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
Tue Sep 25 16:16:16 CST 2018 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.
2018-09-25 16:16:17.403 ERROR 15528 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Exception during pool initialization.

1、mysql-connector-java

由于springboot自带 mysql-connector-java版本过高，导致连接失败，最终导致连接池启动失败。
降低mysql-connector-java的版本。

    org.springframework.boot
    spring-boot-starter-jdbc


    mysql
    mysql-connector-java
    5.1.40
    runtime

2、useSSL

useSSL=false 处出错，改为useSSL=true

3、查看数据库启动

重新启动数据库