I am guessing it would when more users come into the system, but why would this
cause a jump in memory utilization in tomcat and then hanging. If you could
throw more light at this?
Also, I am not sure if these are pointing to the problem.
-Ayush
> Date: Tue, 12 Feb 2013 16:00:12 -0200
> From: edsonrich...@hotmail.com
> To: users@tomcat.apache.org
> Subject: Re: Tomcat hanging unexpectedly [URGENT]
>
> Em 12/02/2013 15:53, Cool Techi escreveu:
> >
> >
> > I am new to this, I have just installed YourKit and see a lot of threads
> > blocked,but currently my response are fine, the blocked thread are showing
> > the following
> >
> > Blocker Thread QuartzSchedular_Worker-6 native ID ..
> >
> > On clicking on the Blocker thread it shows me the following,
> >
> >
> >
> > org.apache.log4j.Category.callAppenderscom.mysql.jdbc.SingleByteCharsetConverter.getInstanceorg.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrorObject()org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.addObjectToPool()ogr.apache.tomcat.dbcp.pool.impl.GenericObjectPool.getNumIdle
>
> Would it have exhausted database connections limit?
>
> Edson
>
> > Does any of these sound like reason. It would be great to get pointed in
> > the right direction.
> > Regards,Ayush
> >
> >> Date: Tue, 12 Feb 2013 15:35:40 -0200
> >> From: edsonrich...@hotmail.com
> >> To: users@tomcat.apache.org
> >> Subject: Re: Tomcat hanging unexpectedly [URGENT]
> >>
> >> There is a similar thread published a week ago.
> >> It can be caused by almost anything, and my last suspect would be Tomcat
> >> it self.
> >> Most of time, the cause is some programming error, like:
> >> - missing step out of recursive loop
> >> - loading too many objects is memory (for example, when using JPA where
> >> graph of objects are all connected - so, when you load one object, all
> >> database is read into memory)
> >> - some deadlock in multi-threaded application...
> >>
> >> How to discover:
> >>
> >> 1) Try to get a memory dump and check how your memory is being used
> >> 2) Get a heap dump (stack trace, as well) or currently running
> >> application when it is hang, and check for deadlocks
> >> 3) Use VisualVM to get a big picture of what the virtual machine is doing
> >> 4) Put the application running under profiler (like JRockit Mission
> >> Control, or NetBeans profiler)
> >>
> >> These are some ideas...
> >>
> >> Regards,
> >>
> >> Edson
> >>
> >>
> >> Em 12/02/2013 15:27, Cool Techi escreveu:
> >>> Hi,
> >>>
> >>> We are using tomcat 6.0.26 on windows 2008 web server, with Jdk 1.6.32
> >>> installed on the server.
> >>>
> >>> The
> >>> server seems to be running smoothly most of the time, but suddenly the
> >>> memory used goes very high and tomcat stops responding, the logs don't
> >>> show any out of memory or thread exceptions.
> >>>
> >>> What could be causing this?
> >>>
> >>> Regards,
> >>> Ayush
> >>
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