UnknownHostException while validating xml/dtd files

Solution Verified - Updated -

Issue

Deploying a webapp with (for example) an xml descriptor file:

     <?xml version="1.0" encoding="UTF-8"?>
     <!DOCTYPE facelet-taglib PUBLIC "-//Sun MicroSystems, Inc//DTD Facelet Taglib 1.0//EN"  "http://java.sun.com/dtd/facelet-taglib_1_0.dtd">

     <facelet-taglib> ..... </facelet-taglib>

Throws this error:

     SEVERE [facelets.viewhandler] (http-0.0.0.0-80-1) Error Loading Library: /WEB-INF/facelets/ABC.taglib.xml

     java.net.UnknownHostException: java.sun.com

Environment

Java configuration

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