title: Java connectivity issue
body: <p>I am getting following error.</p>
  
  <blockquote>
    <p>com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last
    packet successfully received from the server was 37,787,544
    milliseconds ago.  The last packet sent successfully to the server was
    37,787,544 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.</p>
  </blockquote>
  
  <p>Once I restart the application, it works OK for some time and then the same error comes up.</p>