Charles,
Thanks for your patient responses. Unfortunately, the "shared classloader" does
not
work either. This is in summary what I am trying to do: I have 3 webapp
contexts that
use a number of commons libraries (say, digester, betwixt, beanutils). I do not
want to
pack these jarfiles in each webapp, as it makes the warfiles unwieldy. Hence I
want the
deployment structure:
(CATALINA_HOME
(mycommonlibs)
(webapps
(webapp1)
(webapp2)
(webapp3)
)
)
I merely want the webapp classloader of each webapp1 to load classes not only
from WEB-INF/{classes|lib}
but also from ${CATALINA_HOME}/mycommonlib. That is, I am willing to load each
common jar
distinctly in each webapp and pay the price in terms of memory for the
duplicate loads. I merely
want to co-locate the common jarfiles in a common directory.
Now, when I opt to use the shared classloader with the following entry in
catalina.properties:
## catalina.properties::
shared.loader=${catalina.home}/myapplib,${catalina.home}/myapplib/*.jar
it turns out that the classes in ${catalina.home}/myapplib/*.jar are loaded by
StandardClassLoader (parent of WebappClassLoader) while the libraries in
webapp?/WEB-INF/{classes|lib} are loaded by WebappClassLoader. This causes
strange errors with classes not being found or, worse still, methods not being
found.
For instance, I have placed commons-digester in ${catalina.home}/myapplib/.
I have an XML file in webapp3 which is parsed into JavaBeans which are defined
in
webapp3/WEB-INF/lib/foo.jar.
With the catalina.properties specified as above, it turns out that digester
is loaded by the StandardClassLoader while foo.jar is loaded by
WebappClassLoader:
(I am printing the class loader lineage of a bean):
2008-01-16 11:43:37.0522 INFO Bean:foo, class:Foo loaded by:
org.apache.catalina.loader.WebappClassLoader
org.apache.catalina.loader.StandardClassLoader
org.apache.catalina.loader.StandardClassLoader
sun.misc.Launcher$AppClassLoader
sun.misc.Launcher$ExtClassLoader
2008-01-16 11:43:37.0412 INFO Bean:Digester,
class:org.apache.commons.digester.Digester, loaded by:
org.apache.catalina.loader.StandardClassLoader
org.apache.catalina.loader.StandardClassLoader
sun.misc.Launcher$AppClassLoader
sun.misc.Launcher$ExtClassLoader
Hence while digester is loaded by StandardClassLoader, the beans that Digester
must
instantiate are loaded by WebappClassLoader.
Since StandardClassLoader is the parent of WebappClassLoader, per the
delegation model,
digester will fail to find the application beans it needs.
I need the libs in myapplib/ loaded by the webappclass loader of each webapp
context.
What is the simplest way to accomplish this?
Regards,
/U
--
-------------- Original message ----------------------
From: "Caldarale, Charles R" <[EMAIL PROTECTED]>
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> > Subject: Problems with VirtualWebappLoader (Was RE: Tomcat
> > 6.0.x Classloader sequence)
> >
> > Following on an earlier thread: I am trying to place
> > the libraries common to a number of webapp contexts
> > in a common directory (${catalina.home}/myapplib)
>
> Have you thought about just configuring this in the shared classloader
> in conf/catalina.properties?
>
> - Chuck
>
>
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