Page parameter propagation not working?

[sunfire]

Hi there,

I have a page with a Gallery.page.xml looking like this:

<?xml version="1.0" encoding="UTF-8"?>
<page xmlns="http://jboss.com/products/seam/pages"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://jboss.com/products/seam/pages http://jboss.com/products/seam/pages-2.0.xsd"
 login-required="true">

 <param name="tankId" value="#{tankHome.tankId}" required="true"/>

</page>

This works great when you link to the page with things like <s:link view="/Gallery.xhtml" value="Gallery"/>. Basically tankId is populated when you use GET parameters.
Within the Gallery.xhtml page I have a form that allows for picture uploading. When I hit the upload button I get

javax.faces.validator.ValidatorException: value is required

If I remove the required="true" attribute from the param it works like a charm. Only thing is I have no way of enforcing that a valid id is being provided. I thought that this stuff gets automatically populated if I stay withinn the same page and the page parameter is set? It work for links but not for JSF form submissions.
I also tried this

<?xml version="1.0" encoding="UTF-8"?>
<page xmlns="http://jboss.com/products/seam/pages"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://jboss.com/products/seam/pages http://jboss.com/products/seam/pages-2.0.xsd"
 login-required="true">

 <param name="tankId" value="#{tankHome.tankId}" />
 <restrict>#{tankHome.tankId != null}</restrict>

</page>

but with this I get

org.jboss.seam.security.AuthorizationException: Authorization check failed for expression [#{tankHome.tankId != null}]

when I submit the upload form. Again the entire upload thing works fine as long as I don't try to validate/restrict the tankId/tankHome in page.xml.

I wonder if I got some concepts of auto parameter propagation wrong or if this is a bug?

Thanks, Thorsten

[sunfire]

btw: Seam version is 2.0.1.CR1 running on JBAS 4.2.2.GA

[christian.bauer]

Page parameters are for GET requests, not POST requests.

[sunfire]

Hm, then I guess this wording from the docs is a little bit misleading, no?

The value is transparently propagated with any JSF form submission for the page with the given view id.

Sounded to me as if it was supposed to work for POST's (JSF form submission) as well.

[christian.bauer]

Uhm, forget it, i meant page actions.

[sunfire]

I am confused now. :) So is it supposed to work or not?

[andygibson]

Yes, it is supposed to work. Page parameters can be used on posts.

It should work as listed, my only hesitation is regarding the issue of a file upload. I have forms with page parameters that are sent back and forth in form POSTs.

Try it without the form upload, just a button which calls a blank method that returns null.

Cheers,

Andy

[pmuir]

http://jira.jboss.com/jira/browse/JBSEAM-2112

I now understand the issue :)

[sunfire]

Yes, the JIRA issue Pete posted seems to be the one I am struggling with. :) I also just tried it without the file upload but only a null returning h:actionButton in the form with the same result as with the file upload.

[matt.drees]

http://jira.jboss.com/jira/browse/JBSEAM-2112

I now understand the issue :)

My bad... I should have been more clear in my description.

[pmuir]

Matt, not your fault at all. I just didn't think things through very well in terms of why the parameters would be propagated but the null check fail.