[opencms-dev] AW: Tomcat memory leaks on webapp restarts

[Claus Priisholm]

Could be something like that - I've noticed some "OutOfMemoryError: 
PermGen space" exceptions after repreated instance restarts. It seems 
that running out of PermGen space is often due to classes not being 
GC'ed upon instance restart.
Of course a restart of tomcat will fix it, but this may not be feasible 
if one is running other apps/instances in the same tomcat.

Jonathan Woods wrote:
> I recall a recent thread in which someone pointed out that Tomcat 
> gradually took up more and more memory on each each restart of a webapp 
> running within it.
>  
> I wonder if the fault lies in using Jakarta Commons Logging 
> (JCL) libraries prior to v1.1?  See 
> http://jakarta.apache.org/commons/logging/guide.html#Classloader_and_Memory_Management for 
> a discussion in which it's made clear that for versions prior to 1.1, 
> classes which call LogFactory.getLog(...) must also call 
> LogFactory.release(), or risk having references to loaded classes held 
> on to by the logging framework.
>  
> Offhand, I don't know which version of JCL is distributed with 6.0.4 and 
> 6.2.1, but if you're suffering from Tomcat memory leaks you could do 
> worse than try upgrading to JCL 1.1.
>  
> Jon
>  
> 
> 
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