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From Henri Yandell <>
Subject Re: ?? Using Taglib JARs Across Multiple Contexts ??
Date Tue, 10 Dec 2002 02:06:21 GMT

I think this came up a while ago. If I recall correctly, the only solution
was to use symbolic links, and there is no solution if you are packaging
your code in WARs.

This obviously only works on platforms that support sym links fully, and I
don't think Windows platforms do.

I believe the thread was on this mail list [rather than Developers] so you
might be able to find something on it by going to an archive and having a
search. I may be misrepresenting the summary from it.

I agree with you, it's a fair bit of a pain. I'd also like to see some way
to have a config file for a WAR which is outside the WAR. Maybe if I put
myProd.war.conf.xml or some such in the webapps or deploy directory, then
it would automatically merge it in with the unpacked WAR file.


On Mon, 9 Dec 2002, Tony LaPaso wrote:

> Hello all,
> Although I'm using Tomcat v4.1.12 with Apache's JSTL Taglib, this issue
> really applies to *all* taglibs, not just JSTL:
> I'm finding that if I have several webapps (i.e., several Contexts), all
> using JSTL, I need to replicate the taglib JARs (jstl.jar and standard.jar)
> to the "WEB-INF/lib" directories of *each* webapp using JSTL. Of course,
> this means that each webapp loads its own copy of the classes contained in
> those JARs. That seems a bit wasteful.
> I would much rather put the JARs in a common directory, (e.g., Tomcat's
> "common/lib") thereby allowing all webapps to share the same JARs.
> Unfortunately, this technique does not work. When I move the JARs to
> Tomcat's "common/lib" directory I receive an error when I try to run a JSP
> containing a JSTL tag. The error message indicates the JAR (jstl.jar) cannot
> be found.
> My TLD resides in "\WEB-INF". I do *not* have <taglib> elements in web.xml.
> One suggestions I received was to include <taglib> elements in web.xml but
> that will not work since the <taglib-location> element cannot refer to a
> location outside the current context.
> Does anyone have an idea about this -- how to share taglib JARs across
> contexts?
> Thanks...
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