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

org.activiti.engine.ActivitiException: couldn't check if tables are already present using metadata: 
### Error getting a new connection.  Cause: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (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.)
### Cause: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (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.)

报错信息如下：

解决方法：修改url

增加​​?serverTimeznotallow=UTC​​

再次运行，成功