An invalid XML character (Unicode: 0x0) was found in the comment

Keywords:
xerces "An invalid XML character (Unicode: 0x0) was found in the comment"

Problem:
This is a very specific problem I admit, but what are you meant to do? From the error message list for the Xerces parser, it's clear that this "0x0" character is a bad thing, but it's also clear that I haven't put this character in the document.

Something's wrong with the reading/processing of the byte stream containing the XML content.

Solution:
A very specific solution too. In this case it was that file was being stored using a Slide implementation that came with JBoss. I don't know anything about this implementation, but it doesn't seem to work when you're accessing it (via WebDAV) with jakarta-slide-client libraries. Switching the storage to using the latest version from Jakarta fixed this issue.