org.apache.openjpa.persistence.PersistenceException: The last packet
successfully received from the server was 187,404,662 milliseconds ago.
The last packet sent successfully to the server was 187,404,662
milliseconds ago. is longer than the server configured value of
'wait_timeout'. You should consider either expiring and/or testing
connection validity before use in your application, increasing the
server configured values for client timeouts, or using the Connector/J
connection property 'autoReconnect=true' to avoid this problem.