[jboss-dev] Multiple classLoaders for a single WAR file on Tomcat

[Adrian]

I assume this is because Servlets can be individually reloaded?

On Fri, 2007-08-03 at 17:11 -0500, Clebert Suconic wrote:
> This is probably a question for Remy:
> 
> Why Tomcat creates multiple ClassLoaders for every deployment?
> 
> Is this by design or this is a leak?
> 
> For a single WAR, I'm seeing 4 classLoaders deployed just wasting 
> PermGeneration memory.
> 
> For example, I deployed a single WAR, and I've got this Servlet loaded 
> by 4 distinct classLoaders. and this is a standard behavior I have seen 
> on Tomcat for a long time already.
> 
> org.jboss.on.plugins.servlet.test.Counter:
> 
> - java.net.URLClassLoader at 10891966
> - org.jboss.web.tomcat.tc5.WebAppClassLoader at 18775238
> - java.net.URLClassLoader at 22498184
> - org.jboss.web.tomcat.tc5.WebAppClassLoader at 8238932
> 
> 
> Also... if you use any other profiler (besides the ClassLoader analysis 
> I've written on JBossProfiler) you could be foolished by them as those 
> classes won't have any instances... Just the classDef loaded on the heap.
> 
> 
> 
> Clebert
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Adrian Brock
Chief Scientist
JBoss, a division of Red Hat
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