I have run into the same issue. The @XmlType http://java.sun.com/javase/6/docs/api/javax/xml/bind/annotation/XmlType.h... says: "All of the JavaBean properties being mapped to XML Schema elements must be listed.". The issue may therefore not be in org.jboss.ws.metadata.umdm.FaultMetaData, which is correctly assuming propOrder is defined, but in JAX-WS RI, that is not creating propOrder. Also, when propOrder is not defined, the default value is String[] {""}: an array with one empty String... which is odd and causes JBossWS to fail. I have opened two discussions on why JAX-WS RI is not creating propOrder: http://forums.java.net/jive/thread.jspa?threadID=61739 http://forums.sun.com/thread.jspa?threadID=5387902 View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4232605#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...