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From uma...@comcast.net
Subject RE: Tomcat 6.0.x Classloader sequence
Date Fri, 16 Nov 2007 02:08:36 GMT
Charles,

Even if I place the jarfiles in a common path, they will be loaded by the webapp classloader
right? Which means that each webapp would load the jars anew. 

The distinct webapps are taking up a lot of heapspace and affecting Tomcat.
I would like to load the common jarfiles using commons classloader and yet not
mix the jarfiles with the "system" libraries in ${CATALINA_BASE}/lib.

Is it possible for me to instruct commons classloader to load from another
directory parallel to ${CATALINA_BASE}/lib?

Thanks,

/U

--
 -------------- Original message ----------------------
From: "Caldarale, Charles R" <Chuck.Caldarale@unisys.com>
> > From: Caldarale, Charles R [mailto:Chuck.Caldarale@unisys.com] 
> > Subject: RE: Tomcat 6.0.x Classloader sequence
> > 
> > > Is it possible for me to configure the webapp class 
> > > loaders to load classes from a path common to multiple
> > > webapps before loading from the webapp itself?
> >
> > Browsing through the Tomcat source does turn up something called
> > VirtualWebappLoader; the comments therein indicate this is intended to
> > provide what you want.
> > 
> > I couldn't actually get it to work, but it is intriguing...
> 
> With a little more playing around, I did get it to work.  Your webapps
> will need a <Context> similar to the following:
> 
> <Context>
>   <Loader className="org.apache.catalina.loader.VirtualWebappLoader"
>           virtualClasspath="C:/dir/classes"/>
> </Context>
> 
> I assume if you put this in conf/context.xml, it will apply to all
> webapps.  Multiple locations can be given in the virtualClasspath
> attribute by separating them with semicolons; each jar must be specified
> separately.
> 
> Using the MBeans tab of JConsole, you can see the paths used by each
> individual classloader; look in the Catalina -> Loader -> <appname> ->
> <hostname> -> Attributes for classpath.
> 
>  - Chuck
> 
> 
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