If we have a fully loaded war file and we want to use some tag define inside that war file, then how can we reuse tld, tag, or classes define inside that war file to our new web application.
for classes, you can get the context of the application in your war file and then dispatch requests or include content from the war file.
As far as tags go, you can simply take the jar files of the tag libraries and copy them in your new web applications WEB-INF/lib directory. This will allow you to use the tags again by just using the <@taglib %> directive or the using xml namespaces.