I have actually seen errors similar to these too,

[quote]SEVERE: The web application [/public] appears to have started a thread 
named [Timer-0] but has failed to stop it. This is very likely to create a 
memory leak.[/quote]

What I came to realize was that Tomcat was not releasing system resources upon 
shutdown.  This was especially problematic with IDE integration in 
Netbeans/Eclipse.  When I'd stop/start Tomcat and redploy between builds, the 
first or second restart of Tomcat were fine.  After 3 or 4, there were 
problems.  I found that after rebooting my dev box I could once again start 
Tomcat properly and would not encounter those errors anymore.

I tried using IntelliJ instead of Netbeans and I haven't encountered the 
problem again.  I did see it once on a production box, but went to the old 
reboot trick and it worked.  Didn't see it ever again, so I'm not sure what 
exactly caused it.

But it makes me fear deployment on Tomcat.  Almost want to say, "bump it" and 
start deploying on JBoss or some other application server.

-- 
Context is everything: 
http://forum.magnolia-cms.com/forum/thread.html?threadId=f3b8e656-fc02-4fe4-bf40-98d40bdfb9db


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