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From "Shapira, Yoav" <>
Subject RE: Memory Usage - Tomcat 5.0.25
Date Mon, 09 Aug 2004 17:35:18 GMT

I have a couple of ideas.  One is that your webapp maintain static or
shared references to objects that prevent them from being garbage
collected, and therefore memory from returning to the heap.  Another is
that a webapp undeploy is not guaranteed to reclaim all memory used by
the webapp anyways so to count on this behavior is not smart.  It is
expected that every time you reload your webapp the overall memory usage
of the server will go up a bit, as not all objects are gone (for
example, if you have a static reference than the old classloader and
anything that references it strongly will remain in memory).

Yoav Shapira
Millennium Research Informatics

>-----Original Message-----
>From: Nandish Rudra []
>Sent: Monday, August 09, 2004 1:17 PM
>To: Tomcat Users List (E-mail)
>Subject: Memory Usage - Tomcat 5.0.25
>I am having some memory issues while deploing/undeploying web
>to Tomcat. I am using Tomcat 5.0.25 with Java 2 SDK version 1.4.2_04
>1.6.1 on GNU Linux 2.4.20-8. I use ant to compile my web application
>Tomcat's catalina-ant.jar to deploy it automatically.
>Here is my problem. When I undeploy/remove an application, Tomcat does
>reclaim the memory being used by the web application and when the
>application is re-deployed/re-installed a significant increase in
memory is
>seen. This increase is obviously the memory usage by the new instance
>web application.
>Does anyone have any idea as to why this is happening?
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