Communications link failure The last packe The last packet successfully received from the server wa

Error message:

Communications link failure

The last packet successfully received from the server was 216,152 milliseconds ago.  The last packet sent successfully to the server was 105,381 milliseconds ago.

Plus

druid:
  test-on-borrow: true
  test-on-return: true
  test-while-idle: true
  validation-query: SELECT 1

Of course, if you are using a druid connection pool