That is a very good question... there is no error message at all.  However, what I did see was a startup message, like when the database initially starts. Except, I never restarted it!  And the machine did not reboot... are there ever conditions where it auto-restarts itself? 

From: Katherine Marsden <>
To: Derby Discussion <>
Sent: Tuesday, April 24, 2012 5:06 PM
Subject: Re: No Connection Exception

On 4/24/2012 1:19 PM, Tomcat Programmer wrote:

The only way to clear this up seems to be restarting the web container.   Is there some setting in Derby which is causing these connections to go stale?  Is there any way to
trace this and find out the cause?

Is there an interesting error in the derby.log that might indicate when you lost the connection?