After the druid link is not released, the link database times out. Since the 1.016 version was originally used, it needs to be upgraded to the latest version. This is a bug of druid. Upgrading the latest version solves the problem
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 490 milliseconds ago. The last packet sent successfully to the server was 489 milliseconds ago.
Druid use
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