Hello All, We had a problem mapping subclasses of java.lang.Exception in XML using JAXB 2.1. In particular, JAXB tried to map Exception.stackTrace field and failed with the following error: IllegalAnnotationsException: "java.lang.StackTraceElement does not have a no-arg default constructor". Luckily JBoss JAXBIntroductions provided us a workaround. Once I added support for @XmlTransient annotation I was able to annotate Exception with @XmlTransient in JaxbIntros meta data. (Another way may be annotating Throwable.stackTrace). Can I contribute to JaxbIntros project by submitting @XmlTransient support (XmlTransientHandler and XmlTransientIntro) into SVN? Best Regards, Andy Malakov View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4123611#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...