This is also interesting, the log after a redeploy:

Apr 6, 2010 2:04:05 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesJdbc
SEVERE: A web application registered the JBDC driver [com.mysql.jdbc.Driver]
but failed to unregister it when the web application was stopped. To prevent
a memory leak, the JDBC Driver has been forcibly unregistered.
Apr 6, 2010 2:04:05 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[pool-1-thread-1] but has failed to stop it. This is very likely to create a
memory leak.
Apr 6, 2010 2:04:05 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesStopTimerThread
SEVERE: A web application appears to have started a TimerThread named [MySQL
Statement Cancellation Timer] 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.
[Deprecated] Xalan: org.apache.xml.security.c14n.CanonicalizationException
Apr 6, 2010 2:04:06 PM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive cas.war
Apr 6, 2010 2:04:26 PM org.apache.coyote.http11.Http11Protocol pause
INFO: Pausing Coyote HTTP/1.1 on http-8080
Apr 6, 2010 2:04:26 PM org.apache.coyote.http11.Http11Protocol pause
INFO: Pausing Coyote HTTP/1.1 on http-8443
Apr 6, 2010 2:04:27 PM org.apache.catalina.core.StandardService stop
INFO: Stopping service Catalina
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[scheduler_Worker-1] but has failed to stop it. This is very likely to
create a memory leak.
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[scheduler_Worker-2] but has failed to stop it. This is very likely to
create a memory leak.
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[scheduler_Worker-3] but has failed to stop it. This is very likely to
create a memory leak.
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[scheduler_Worker-4] but has failed to stop it. This is very likely to
create a memory leak.
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[scheduler_Worker-5] but has failed to stop it. This is very likely to
create a memory leak.
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[scheduler_Worker-6] but has failed to stop it. This is very likely to
create a memory leak.
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[scheduler_Worker-7] but has failed to stop it. This is very likely to
create a memory leak.
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[scheduler_Worker-8] but has failed to stop it. This is very likely to
create a memory leak.
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[scheduler_Worker-9] but has failed to stop it. This is very likely to
create a memory leak.
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads
SEVERE: A web application appears to have started a thread named
[scheduler_Worker-10] but has failed to stop it. This is very likely to
create a memory leak.
Apr 6, 2010 2:04:27 PM org.apache.catalina.loader.WebappClassLoader
loadClass
INFO: Illegal access: this web application instance has been stopped
already.  Could not load com.mysql.jdbc.SQLError.  The eventual following
stack trace is caused by an error thrown for debugging purposes as well as
to attempt to terminate the thread which caused the illegal access, and has
no functional impact.
java.lang.IllegalStateException
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1402)
 at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1361)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:398)
 at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3317)
 at com.mysql.jdbc.MysqlIO.quit(MysqlIO.java:1668)
 at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4461)
 at com.mysql.jdbc.ConnectionImpl.cleanup(ConnectionImpl.java:1359)
 at com.mysql.jdbc.ConnectionImpl.finalize(ConnectionImpl.java:2809)
 at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
 at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
 at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
 at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)
Apr 6, 2010 2:04:27 PM org.apache.coyote.http11.Http11Protocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-8080
Apr 6, 2010 2:04:27 PM org.apache.coyote.http11.Http11Protocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-8443

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