Server :: Tomcat 6 Error: Timer Already Cancelled

I started seeing error log entries to this effect once we ported a Tomcat webapp, which connects to a remote database, from Tomcat 5 to Tomcat 6.0.26, but it seemed relatively harmless until now. The error we got at first was:

Code:

May 5, 2010 2:36:44 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesStopTimerThread

SEVERE: A web application appears to have started a TimerThread named [Timer-7] via the java.util.Timer API but has failed to stop it. To prevent a memory leak,the timer (and hence the associated thread) has been forcibly cancelled. A restart seemed to cure the server at that point. But now it has died silently: though the process itself was running, the service become unavailable. Entries like this were found in the logs:

Code:

06/15/10 15:05:47.685 EDT -0400 id=1 Error acquiring database:
java.lang.IllegalStateException: Timer already cancelled.
at java.util.Timer.sched(Timer.java:354)

[code].....