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Subject: Re: tomcat 5 and the JVM
From: Ray Holme <rholme@roadrunner.com>
To: Tomcat Users List <users@tomcat.apache.org>
In-Reply-To: <e30079530902020545s5e6308bal35c02665c0eb91d1@mail.gmail.com>
References: <1233579578.6298.327.camel@rainbow.rainbowapps.com>
	 <e30079530902020545s5e6308bal35c02665c0eb91d1@mail.gmail.com>
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Date: Mon, 02 Feb 2009 09:03:07 -0500
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thanks - makes sense.

removed the GC call as someone else put it there a long time ago

also removed System.runFinalization()  - assume this is not something to
do in my "garbage sweep" where I check for other things.

:=]
On Mon, 2009-02-02 at 14:45 +0100, Kees de Kooter wrote:
> Hi Ray,
> 
> It is one JVM, but separate classloaders so applications do not "see"
> classes of other apps.
> 
> Oh and please be extremely careful with using System.gc(). Using it
> can lead to severe and unexpected performance issues. If you "need"
> gc() you almost always have a flaw in your code.
> 
> Cheers,
> Kees de Kooter
> http://www.boplicity.net
> 
> 
> 
> On Mon, Feb 2, 2009 at 13:59, Ray Holme <rholme@roadrunner.com> wrote:
> > I run tomcat 6 on Linux and have multiple applications in development
> > mode. From my testing I have discovered that a Java bean shared by all
> > applications and with ALL methods as static SEEMS to have  a separate
> > instance for each appliction - i.e.
> >
> >   getDebugLevel() returns 0 from the 2nd application
> >                   even if the first has set it to 100
> >
> > This is useful but contrary to what I would expect. I would expect one
> > JVM for all applications. If there is one per application, that too is
> > cool, but it means that each application must do a
> >
> >  System.gc()
> >
> > occasionally and that this routine cannot be done once for all.
> >
> > So, does someone know for sure - one JVM per Tomcat OR one JVM per app??
> >
> >
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