Regarding my first question, the answer was provided to me on the java.net jaxb 2.0 and jax-ws 2.0 forum: JAX-WS does not support type substitution in cases where Java types are used at runtime that are not directly or indirectly referenced by the SEI. More details on: http://weblogs.java.net/blog/kohlert/archive/2006/10/jaxws_and_type.html In this blog entry it is said that JAX-WS 2.1 solves the issue through a new annotation @XmlSeeAlso, which is used to provide the JAXBContext with classes needed at unmarshalling. What are the plans for incorporating JAX-WS 2.1 in JBossWS? Is there any other solution, which could be applied using JBossWS 1.2? Regarding my other question I am still looking for a hint. How can I unmarshal a double value which is incorrectly tagged as 'xsd:float' in the SOAP reponse? Regards, Magnus View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4028255#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...