undeploy doesn't completely remove classes from memory

["Gormley, Josh" <JG...@parts-unltd.com>]

Hello,

 

I've got a problem with several of the Struts apps that I'm deploying to
Tomcat 5.5.17.  If I redeploy the app by dropping in a new war file, I
almost always have to restart tomcat in order to see the updated classes
take affect.  I've read that this could be caused by threads being left
open and not garbage collected properly or by using Singletons, or
several other things, but I'm having a hard time tracking down the root
of the problem.


What's the best way to get to the root of this problem?  Are there any
known issues with Struts, Hibernate, SQLjdbc that could be causing this?

 

I've tried JProfiler, but I'm having a hard time seeing orphaned object
instances after an undeploy.  I would much appreciate any suggestions
that you might have.

 

Thanks,
Josh Gormley

 

Server config:

Redhat

Tomcat 5.5.17

JRE 1.4.2 with the necessary classes to allow it to work with Tomcat 5.5

 

App info

Struts

Hibernate

SQLjdbc

 

Segment from server.xml:

      <Host name="www.xyz.com" 

            appBase="webapps/xyz" 

            unpackWARs="true" 

            autoDeploy="true"

            xmlValidation="false"

            >

            <Context path="" docBase="" debug="0" >

                  <Resource name="jdbc" scope="Shareable"
type="javax.sql.DataSource" />

                  <ResourceParams name="jdbc">