Java/Mybatis连接MySQL报错Path does not chain with any of the trust anchors 、Communications link failure

MySQL 5.7

链接url：jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=UTF-8

主要报错如下：

org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 1,720 milliseconds ago.  The last packet sent successfully to the server was 1,709 milliseconds ago.

Caused by: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors

造成这个报错可能的原因是链接地址中的 useSSL=true 造成的。

将 useSSL=true 改为  useSSL=false 即可解决。

（把这个 useSSL=true& 删除也可以解决，不过会有一个警告。）

记录一下，希望可以帮助碰到同样问题的朋友。