The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You mu

spring+springMVC+mybatis+mysql启动时，总报错The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.TNN的怎么都查不出原因，后来发现是mysql-connector-java的一个bug: http://bugs.mysql.com/bug.php?id=79343，CNM差点搞死了

[com.alibaba.druid.pool.DruidDataSource]create connection error, url: jdbc:mysql://localhost:3308/mdl?characterEncoding=UTF-8, errorCode 0, state 01S00
java.sql.SQLException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:545)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:505)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:479)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:489)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:69)
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1606)
    at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:633)
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:347)
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:219)
    at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:148)
    at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:220)
    at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142)
    at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1466)
    at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1529)
    at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2109)
Caused by: com.mysql.cj.core.exceptions.InvalidConnectionAttributeException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
    at sun.reflect.GeneratedConstructorAccessor10.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:54)
    at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:73)
    at com.mysql.cj.jdbc.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:118)
    at com.mysql.cj.mysqla.MysqlaSession.configureTimezone(MysqlaSession.java:293)
    at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:2399)
    at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:1739)
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1596)
    ... 9 more

改前：
jdbc_url=jdbc:mysql://localhost:3308/mdl?characterEncoding=UTF-8


改后：
jdbc_url=jdbc:mysql://localhost:3308/mdl?characterEncoding=utf8&useUnicode=true&sessionVariables=storage_engine%3DInnoDB&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC

参考：https://confluence.atlassian.com/bitbucketserverkb/database-migration-to-mysql-fails-java-sql-sqlexception-the-server-time-zone-value-cdt-is-unrecognized-or-represents-more-than-one-time-zone-847457613.html