I found out what's wrong with the setAttribute. It was because I missed the struts-portlet-config.xml file. Once I specified the attribute names in that file, the request.setAttribute(...) works. However, the error handling is still not working. In the ActionForm's validate() method, I have something like this: errors = new ActionErrors(); errors.add(ActionMessages.GLOBAL_MESSAGE, new ActionMessage("error.invalidValue")); .... return errors The struts-bridge documentation says this is automatically handled by the framework, but the JSP <html:errors /> does not show anything. I will try your CustomRequestProcessor to see what happen. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3966834#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...