Well, I've tried Mark's code earlier, albeit without using a properties file 
for Log4J, and the position has
improved slightly.

The log indicates the following:

INFO: Pausing Coyote AJP/1.3 on ajp-8009
Job Job1 unsubmitted at 2010-10-19 15:18:10
24047 [main] INFO org.quartz.core.QuartzScheduler - Scheduler 
DefaultQuartzScheduler_$_NON_CLUSTERED shutting down.
24047 [main] INFO org.quartz.core.QuartzScheduler - Scheduler 
DefaultQuartzScheduler_$_NON_CLUSTERED paused.
24047 [main] INFO org.quartz.core.QuartzScheduler - Scheduler 
DefaultQuartzScheduler_$_NON_CLUSTERED shutdown complete.
Shutting down scheduler
19-Oct-2010 15:18:10 org.apache.catalina.core.StandardService stop
INFO: Stopping service Catalina
19-Oct-2010 15:18:10 org.apache.catalina.loader.WebappClassLoader 
clearReferencesThreads
SEVERE: A web application appears to have started a thread named 
[DefaultQuartzScheduler_Worker-1] but has failed to
stop it. This is very likely to create a memory leak.
19-Oct-2010 15:18:10 org.apache.catalina.loader.WebappClassLoader 
clearReferencesThreads
SEVERE: A web application appears to have started a thread named 
[DefaultQuartzScheduler_Worker-2] but has failed to
stop it. This is very likely to create a memory leak.
19-Oct-2010 15:18:10 org.apache.catalina.loader.WebappClassLoader 
clearReferencesThreads
SEVERE: A web application appears to have started a thread named 
[DefaultQuartzScheduler_Worker-3] but has failed to
stop it. This is very likely to create a memory leak.
19-Oct-2010 15:18:10 org.apache.catalina.loader.WebappClassLoader 
clearReferencesThreads
SEVERE: A web application appears to have started a thread named 
[DefaultQuartzScheduler_Worker-4] but has failed to
stop it. This is very likely to create a memory leak.
19-Oct-2010 15:18:10 org.apache.coyote.http11.Http11AprProtocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-8084
19-Oct-2010 15:18:10 org.apache.coyote.ajp.AjpAprProtocol destroy
INFO: Stopping Coyote AJP/1.3 on ajp-8009

Where there are fewer messages but it still seems as if Tomcat is detecting 
Quartz threads after Quartz is shut down.

So my simple question becomes: do these messages matter if Tomcat is restarted 
or if the host server (which starts
Tomcat as a Windows service) is rebooted?

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