Thank you, Richard, this pointed me in the right direction: My TubelineAssemblerFactory was not used because my jar was after jbossws-metro-wsit-rt.jar in the classpath order. This jar also defines a custom TubelineAssemblerFactory and Metro silently uses the first one. I did not patch the RuntimeModelDeploymentAspect, since it just returns null, causing Metro to search itself. I deleted the META-INF/services entry in the jbossws-metro-wsit-rt.jar and adapted my custom TubelineAssemblerFactory to imitate the WSIT-one Now I crash into https://jira.jboss.org/jira/browse/JBWS-2301, https://jaxb.dev.java.net/issues/show_bug.cgi?id=564 Thank you again, Jan View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4260222#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...