DO NOT REPLY [Bug 15875] New: - Support global sharing of tag libraries

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=15875

Support global sharing of tag libraries

           Summary: Support global sharing of tag libraries
           Product: Tomcat 4
           Version: Nightly Build
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Enhancement
          Priority: Other
         Component: Jasper 2
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: pierre.delisle@sun.com


Being able to share a tag library globally for all the web applications 
running under Tomcat is something that is often desirable.

Unfortunately, the way to do this currently in Tomcat is more complex 
than it should be. While the jar files associated with the taglibs 
to be shared can be "shared" in <tomcat>/shared/lib, the TLD mappings 
must be defined within the web.xml of every web application that wants 
to use that shared library.
(defining the TLD mappings in <tomcat>/conf/web.xml does not currently
work because Jasper only processes TLD mappings in the web.xml of the 
webapp)

JSP 1.2 has simplified the use of tag libraries by supporting the
auto discory of TLD mappings in jar files. One simply has to 
drop the tag-library's jar file at the proper location, and voila... the
container will process any TLD contained in these jar files and record 
the proper mappings.

It would really be nice if it were possible to do the same at the
container (Tomcat) level.

As suggested by Craig, this could be supported in the following way:

Extend the "search for TLDs inside a JAR file" algorithm to work its
way up the parent class loaders as well.  That way, one can simply
drop the jar files of tag libraries to be shared into <tomcat>/common/lib 
and they would be recognized without requiring any TLD mappings in 
any web.xml.

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