This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I suppose if it's an XML format, you'd use javax.xml.parsers, org.w3c.dom, or whatever package handles the XML DOM. But that's not a JBoss question. A JBoss question would be "will JBoss even care if I change thing thing on the fly or will it ignore the changes until I restart"?