How to resolve TLD tab lib import URI on JSP file?

Could you please prepare and provide a small sample project illustrating the problem and
the exact steps to reproduce (complete zipped source tree and project files)?

Try adding the following at the start of your .tld:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"
  "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">

I'm also looking for a way to do this.
It would be awesome if it could be done 

In the project's facets dialog add the directory that contains the TLDs to the "Web Resource Directories" and set the "Path Relative to Deployment Root" to "/WEB-INF/"