title: JDBC communication link failure after some time
body: <p>I am using JDBC with proxool connection pool to connect to mysql DB. 
  I am selecting large number of rows from multiple threads and after some time i get an error saying communication link failure, Last packet sent to the server was ...ago. 
  I am closing connection,statement,resultSet in every thread.
  The fetching time increases gradually and the exception occurs after 5-10 minutes.
  I doubt it is a memory leak, but cant find any clue. </p>
  
  <p>Please let me know the possible reasons.</p>
  
  <p>Thanks,
  Kaka</p>