This is basically a JAXB bug https://jaxb.dev.java.net/issues/show_bug.cgi?id=268. The workaround you can use it to wrap your map into another class. This class has to be annotated with @XmlAccessorType(XmlAccessType.FIELD) since the bug prevents you from adding @XmlElement to your map field. | @XmlAccessorType(XmlAccessType.FIELD) | public class MyMap { | | protected HashMap<String,String> realMap; | | public HashMap<String,String> getRealMap() { | if (realMap==null) { | realMap = new HashMap<String,String>(); | } | return realMap; | } | } | | ... | | @WebMethod | public MyMap getHashMap( String key, String value) { | ... | } | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4108835#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...