Caused_by:_com.mysql.cj.exceptions.CJCommunicationsException:_Communications_link_failure问题解决

第一段：今日学习内容

这其实就是数据库没开启导致,开启就可以了

所以最好,我们修改一下这个时间

重启mysql.

具体异常如下：

[2019-04-20 18:05:2④161] [Druid-ConnectionPool-Create-1967852205] ERROR [com.alibaba.druid.pool.DruidDataSource] - create connection error, url: jdbc:mysql://12⑦0.0.1:3306/db_local?serverTimezone=UTCuseSSL=falseautoReconnect=true, errorCode 0, state 08001
java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:108)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:95)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:87)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:61)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:71)
at com.mysql.cj.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:932)
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:857)
at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:444)
at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:230)
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:226)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:148)
at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:211)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142)
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1410)
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1464)
at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:1969)
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

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