Help with displaying errors in jsp using html:errors/

Question

Here is my problem.
In my overridden ActionForm.validate() method, i am returning ActionErrors (as required). When there are input errors in my form submission, the control goes back to the JSP page i used to read user input (so far so good). The JSP page is rendered fine for taking input for the second time but no errors are displayed although i am using the tag <html:errors/>
I tried to find the org.apache.struts.action.ERROR in my request attributes and it is there with the size of 1 (because i am reporting one error, in my sample run). Any idea why <html:errors/> won't display the errors even though they are there??? Here is what i am doing in my ActionForm class:
public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {
ActionErrors errors = new ActionErrors();
if (this.email == null || this.email.length() < 1) {
errors.add("username", new ActionError
("error.username.required"));
return errors;
Any help is appreciated.

Answer 1

First of all, thanks for taking time to look at my message. Here is how my message-resources tag look like in struts-config.xml file:
<message-resources parameter="ApplicationResources"/>
The "ApplicationResources.properties" file exist in the WEB-INF folder of my application and following are the entries in that file that i think are relevant:
errors.header=<h3><font color="red">Validation Error</font></h3>You must correct the following error(s) before proceeding:<ul>
errors.footer=</ul><hr>
error.username.required=<li>Username is required</li>
Is there anything else needed to go into resource file? Or should i put my resource file somewhere else?