JAXB annotations appear to be missing from classes in JBoss EAP 6

Issue

• While executing the following code snippet:

import com.redhat.gss.MyObject;
import javax.xml.bind.JAXBContext;
JAXBContext jc = JAXBContext.newInstance(MyObject.class); 

• It runs fine in a standalone environment, but in JBoss, getting the following error:

Caused by: com.sun.istack.SAXException2: 
unable to marshal type "com.my.example.request.Payment" as an element 
because it is missing an @XmlRootElement annotation

• The @XmlRootElement annotation is present on MyObject, though. Why can't JAXB see it?