Slow startup first time after reboot

[Jerry Malcolm]

I'm running Tomcat 9.0.56 in a production environment on AWS Linux2.  My 
environment is 4 virtual hosts with about 9-10 web applications on 
each.  The web apps are already expanded in the webapps folder.  So 
there are no war file expansions involved. The first time after I reboot 
the server each web app takes ~15-20 seconds to start up which is an 
eternity to get the full Tomcat up.  But if I stop TC and restart it, 
everything starts up in just a few seconds.  This same situation happens 
on my local windows development machine with eclipse.  After starting 
eclipse, the first TC start I watch the stdout log creep along saying it 
loaded webapp xyz in 18 seconds... then loads the next web app in 16 
seconds, etc.  But if I stop TC and restart, immediate quick load.  No 
errors or anything.  No messages about taglib searches that I've seen.  
Simply starting a web app msg, wait 18 seconds.... completed.   It's now 
gotten so bad in production TC taking so long to start that the heath 
checks are failing, terminating the server, spinning up a new one, and 
the process repeats again.

Any ideas what might be causing this?
Thanks.

Jerry



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