启动项目错误信息

Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Cannot create PoolableConnectionFactory (Communications link failure

Caused by: java.sql.SQLException: Cannot create PoolableConnectionFactory (Communications link failure

Caused by: javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)
at sun.security.ssl.HandshakeContext.(HandshakeContext.java:171)
at sun.security.ssl.ClientHandshakeContext.(ClientHandshakeContext.java:101)
at sun.security.ssl.TransportContext.kickstart(TransportContext.java:238)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:394)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:373)
at com.mysql.cj.protocol.ExportControlled.performTlsHandshake(ExportControlled.java:336)
at com.mysql.cj.protocol.StandardSocketFactory.performTlsHandshake(StandardSocketFactory.java:188)
at com.mysql.cj.protocol.a.NativeSocketConnection.performTlsHandshake(NativeSocketConnection.java:99)
at com.mysql.cj.protocol.a.NativeProtocol.negotiateSSLConnection(NativeProtocol.java:325)
… 54 common frames omitted

场景

本地启动springboot项目，结果报错上述错误，但是其他同事本地启动没问题，linux服务器上也没问题，后来发现是本地安装的jdk版本问题，版本如下：

1. 我的JDK（启动报错）： 1.8.0_291；
2. 同事的JDK（启动正常）： 1.8.0_201；

问题分析

旧版本的JDK默认不使用SSL连接mysql
新版本的JDK默认使用SSL连接mysql

解决办法

连接地址增加useSSL=false，如
jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true**&useSSL=false**