I used SOAP UI (soapui.org) to send the web service requests and following code worked for me | | <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://www.searchforce.net/oneplace-ws/services"> | <soapenv:Header/> | <soapenv:Body> | <ser:showItem> | <!--Optional:--> | <Item xsi:type="Tower" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> | <!--Optional:--> | <itemName>Test items</itemName> | </Item> | </ser:showItem> | </soapenv:Body> | </soapenv:Envelope> | This code worked with JBOSS 4.0.5 as well as JBOSS 4.2.3. I do receive this exception on first try. I think the problem was in setting xsi:type correctly. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4226617#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...