>  This problem is pretty common when restarting web applications. Libraries
>  that use singletons etc. don't get reinitialized correctly when the web
>  application is reloaded.

Blimey, that sounds like a serious flaw :S

Do you know why they don't get reinitialized properly?  Could you give me a
pointer so i can diagnose if this is truly the case in our situation?  (not
that i don't believe you but before i tell our administrators that they're
going to have to do everything differently i'd like to be able to give them
some evidence)

My administrator assures me that this didn't used to be the case for tomcat
4.x so what changed i wonder?

By the way, a couple of things that may be of interest and some further
relevant questions:  

[1] To cut a long diagnostic story short I found that if you removed the
leading 3 from the %3x portion of my layout conversionpattern then that
error is no longer encountered, the webapp restarts and the user is able to
log in.  BUT after my user is successfully returned from LDAP authorization
and (is supposed to be) redirected back to the first page of my
application... processing stops, all i get is a blank screen and the url
that ends in j_security_check.  But no errors are logged anywhere that i can
see.

Q.  Could this be caused by the same reinitialization problem?  We do use
singletons in our own code.

[2]  The exact same stop/start problems occur if i deploy a war file under
/webapps where we specify unpacked="false".  This isn't too surprising,
however...... my colleague deploys his webapps under a
$TOMCAT_HOME/myWarfiles directory and has changed the docBase.  (He did this
because of the annoying context.xml deleting/management behaviour and his
reluctance to include configuration files in a war file to be passed to
development)  but he can stop/start undeploy/redeploy his (packed) warfiles
with no problem.

Q.  How does this fit with the reinitialization issue you describe?



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