The prod build should produce -sources jars for the Maven repository. https://brewweb.devel.redhat.com/buildinfo?buildID=268865
This is already done as part of the fix for bug #957679.
Verified for EAP 6.2.0 ER7. There are jboss-eap-6.2.0.GA-maven-repository/com/sun/xml/bind/jaxb-xjc/2.2.5.redhat-7/jaxb-xjc-2.2.5.redhat-7-sources.jar and jboss-eap-6.2.0.GA-maven-repository/com/sun/xml/bind/jaxb-impl/2.2.5.redhat-7/jaxb-impl-2.2.5.redhat-7-sources.jar in jboss-eap-6.2.0.ER7-maven-repository.zip.