Hi,
I am memory profiling a webapp for my company because we suspect it
has memory leaks when redeploying. This webapp has to be redeployed
several times a week for security reasons (most of the time it is
undeployed) and the memory leaks forced us to shutdown tomcat once a
week to avoid OOM exception.
I'm using jvm1.5 and tomcat 6.0.13 (also tried with 6.0.14 and today
with 6.0.16), and Yourkit as the profiling tool. I have made the test in
both linux and windows.
I have created a JMeter test to deploy the app using the manager,
make some request to the app and then undeploy it using again the
manager app in a loop. After some redeployments, I got my
OutOfMemoryException. Then I checked with my profiling tool and found
that my own classes were correctly destroyed, and the classes retaining
more memory were these ones (listed as a heirarchy):
org.apache.catalina.core.ApplicationContext$DispatchData
org.apache.catalina.core.ApplicationContext
mapper of org.apache.catalina.core.StandardContext
context of org.apache.tomcat.util.http.mapper.Mapper
resources of org.apache.tomcat.util.http.mapper.Mapper$Context
cache of org.apache.naming.resources.ProxyDirContext
cache of org.apache.naming.resources.ResourceCache
org.apache.naming.resources.CacheEntry[]
The number of objects of each class were exactly the number of times
I had redeployed the webapp. I have checked the contents of CacheEntry
inside CacheEntry[] and it has an attribute "name" and the contents are
the jsps and tld files of my app. There are as many CacheEntry with the
same jsp attribute as times the webapp has been reloaded.
I have made a simple webapp with 2 jsp and a taglibrary, and the
memory leak is still there, so I guess there is no cleaning of
CacheEntry resources at context shutdown.
Have I found a memory leak in Tomcat?
Is my explanation correct or I have missed the leak source?
Should I open a BZ issue?
Is there any workaround to clean this resources on context shutdown?
--
-------------------------------------------------------------
Diego Rodríguez Martín
ALTIRIA TIC - Servicios SMS - Desarrollo Web
Tel. +34 913311198 - Fax +34 915713993 - Móvil +34 610299750
www.altiria.com
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