DocumentBuilderFactory , JavaDoc. .
I suspect your JBoss startup script is setting the system property incorrectly javax.xml.parsers.DocumentBuilderFactory(I saw this before to avoid an error in the released library). I would start by grepping the JBoss configuration directory for this property, and then explicitly set the property jaxp.debug(also described in the link). Assuming your script run really sets the property explicitly, find out who made this change and asked him / her if you can remove it (or provide you with the correct JARs if not).
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