[pentaho 6.0] Mysql connection timeout issue

Hi folks,
in my pentaho installation I got this error:

The last packet successfully received from the server was 280.465.302 milliseconds ago. The last packet sent successfully to the server was 280.465.364 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.

Tipically this error appens when I run a report/dashboard after the pentaho server has been "in paused" for several hours.
I use mysql db connections.

Looking for a solution I found this:
http://wiki.pentaho.com/display/Serv...ring+for+MySQL (Dealing with MySQL connection death after 8 hours)
I tried to apply these tips, but nothing has changed.
Any suggestions on this?
Thanks