Apache xml-commons resolver (1.1b1 shipped in lib/endorsed) does not correctly convert paths to URLs (using File.toURL or similar), instead simply putting "file:" on the front and passing it to the URL constructor. This does not work on Windows since "file:C:\..." is not a valid file URL, it should be "file:/C:/..." instead.

This did not affect EAP 5.1.1 and earlier since out FileURLConnection code had incorrect URL deconstruction code, so the bugs cancelled out. That debug was fixed in JBCOMMON-106, triggered this one to be encountered.

Upstream resolver 1.2 has a partial fix for this (see https://issues.apache.org/bugzilla/show_bug.cgi?id=28719), which handles basic Windows paths but still does not correctly handle UNC paths (\\host\share\...).