Look for an exception in the logs. Empty output usually means an
uncaught exception.
--David
Andy wrote:
Hi All,
I'm unable to output any errors using <html:errors/> tag, in Tomcat
5.5.7 I've tried numerous configurations and have now ran out of patience.
As I haven't been using Struts for more than three days I hope somebody
more experienced can point help me out.
When I select Submit, entering data into my form fields so the form is
parsed as valid, the forward works correctly. When I leave the fields
empty, so the form is parsed as invalid, I just get an empty page back -
which must be generated by Struts as it doesn't match any HTML I have.
Here is what I have in various files -
----------------------------------------------------------------------------
----
logon.jsp -
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<%@ taglib uri="/tags/struts-html" prefix="html" %>
<html>
<head>
<title><bean:message key="logon.title"/></title>
</head>
<body>
<html:errors/>
<html:form action="/SubmitLogonForm.do">
<table>
<tr>
<td>Username</td>
<td><html:text property="username"/></td>
</tr>
<tr>
<td>Password</td>
<td><html:text property="password"/></td>
</tr>
<tr>
<td>
<html:submit/>
<html:cancel/>
</td>
<td></td>
</tr>
</table>
</html:form>
</body>
----------------------------------------------------------------------------
----
In LogonAction.java -
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
if (isCancelled(request)) {
log.debug("cancel pressed");
return mapping.findForward(Constants.FAILURE);
}
LogonForm logonForm = (LogonForm)form;
log.debug("username "+logonForm.getUsername());
log.debug("password "+logonForm.getPassword());
return mapping.findForward(Constants.SUCCESS);
}
----------------------------------------------------------------------------
----
In LogonForm.java (I have getters/setters for HTML fields, and a reset
method,
not shown) -
public ActionErrors validate(ActionMapping actionMapping,
HttpServletRequest httpServletRequest) {
log.debug("validate");
ActionErrors errors = new ActionErrors();
if
(FormUtils.isNullOrEmpty(httpServletRequest.getParameter("username"))) {
log.debug("logon.form.username.invalid");
errors.add(ActionErrors.GLOBAL_MESSAGE,new
ActionMessage("logon.form.username.invalid"));
}
if
(FormUtils.isNullOrEmpty(httpServletRequest.getParameter("password"))) {
log.debug("logon.form.password.invalid");
errors.add(ActionErrors.GLOBAL_MESSAGE,new
ActionMessage("logon.form.password.invalid"));
}
return errors.isEmpty() ? null : errors;
}
----------------------------------------------------------------------------
----
Two tags of interest from struts-config.xml -
<!-- Process a user logon -->
<action path="/SubmitLogonForm"
type="template.action.LogonAction"
name="LogonForm"
scope="request"
input="/logon.jsp">
<forward name="success" path="/welcome.jsp" />
</action>
<!-- Logon form -->
<form-bean name="LogonForm" type="template.form.LogonForm"/>
----------------------------------------------------------------------------
----
ApplicationResources.properties - Note this is found and read by Tomcat, I
can
pull values from it using bean:message - the errors.head and prefix are not
displayed however, so clearly no error messages are being generated at all.
index.heading=Index Page Heading
index.logon=Logon
index.register=New User
#
struts.logo.path=/struts-power.gif
struts.logo.alt=Powered by Struts
# form fields
logon.form.username.invalid=Username invalid
logon.form.password.invalid=Password invalid
# page titles
error.title=Error Title
logoff.title=Logoff Title
logon.title=Logon Title
register.title=Register Title
welcome.title=Welcome Title
#
errors.header=Errors
errors.prefix=Error prefix
----------------------------------------------------------------------------
----
Well it's 2AM here in London, so here's hoping for an answer when I get up
later
today !
TIA,
Andy.
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