EJB fails to read xml when invoked via ESB in JBoss SOA

Issue

• We have an isolated esb and an isolated ear with an ejb
• The issue is when the esb invokes the ejb via the ejbprocessor, the ejb fails to load an xml file which is packaged in the ejb jar. 
• Apache Commons Configuration is used to read the configuration xml (looking at source it uses the Thread context classloader when locating the resource)
• In testing if the client calling the ejb is withing the ear with the ejb / configuration xml, it is able to load the xml sucesssfully.