Q1. How come I do not see validation warning messages?
I have prepared validation.xml and put it together
with the validator-rules.xml in the AppName/WEB-INF
directory. I have also prepared the warning messages
in the
AppName/WEB-INF/classes/resources/application.properties
corresponding to the value of the 'key'
attributes.
The idea with form validation is that validation errors should be displayed close to where the errors occurred -- that is, on the input form. When Struts detects validation errors, control is returned to the resource identified in the input attribute of the ActionMapping, which is typically coded in such a way that the form is populated with exactly what the user typed into them (which is why form bean attributes are usually all Strings) and the errors are displayed next to each field in error.
In your case, part of the JSP page is trying to read from a request bean that was originally populated in some other action as part of another request. When the <bean:define/> tag is called from the JSP page, it throws a ServletException. Struts at this point is completely out of the picture (it forwarded control to the JSP page), so the default JSP exception handling mechanism kicks in and you get something ugly.
Q2. What should I do? My action servlet passes this Collection PageBeans in a request scope to create a drop-down menu in the 'content.jsp'. If validation errors occur and the control returns to the 'content.jsp', I have the error message 'cannot find bean PageBeans' in scope request'. How to handle this kind of situation?
That's a trickier question and depends a lot on how the PageBeans bean was originally populated. You will probably need to write an Action whose execute method reads something like:
public ActionForward execute(...) {
if (request.getAttribute("PageBeans") == null)
request.setAttribute("PageBeans", model.getPageBeans());
return mapping.findForward("success");
}Then, create an action mapping like:
<action path="/content/newContent.do"
type="new.action.from.above">
<!-- forward to JSP page -->
<forward name="success" path=".frame.Content"/>
</action>and change all references to .frame.Content to the new action path.
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