It should be equivalent to: | @XmlAttribute(required=true) private double value; | anonymous wrote : | without the @XmlTransient tag on getValue() I observed an illegal annotations error indicating that the attribute value and the method getValue() are somehow duplicating eachother as far as JAXB is concerned. | Right, this is what I meant by "some unexplainable things" in my last post. I found that this exact issue could be got around by placing the annotation on the method Vs the field. So in JAXB Intros config.... | <?xml version = "1.0" encoding = "UTF-8"?> | <jaxb-intros xmlns="http://www.jboss.org/xsd/jaxb/intros"> | <Class name="junit.prices.UnitPrice"> | <XmlType name = "UnitPrice"/> | <Method name="getValue"> | <XmlAttribute name="value" required="true" /> | </Method> | </Class> | </jaxb-intros> | Have you tried this? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4073308#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...