[jboss-user] [JBoss Seam] - Re: Action argument is null when it shouldn't be null

[michaelcourcy]

"grettke_spdr" wrote : This code from the sample works just fine though:
  | 
  | <s:link id="viewHotel" value="View Hotel" action="#{hotelBooking.selectHotel(hot)}"/>

Yes I ran into this problem until I unserstand that a link is a link and a post is a post ;)

Wich means that  using such expression 


  | <s:link id="viewHotel" value="View Hotel" action="#{hotelBooking.selectHotel(hot)}"/>
  | 

make sens only if the #{hotelBookings} collection exist in one the available scope.

in you watch carefully the Scope of #{hotelBookings} in the seam-books example, it's a session scope.

It's really consistent, as you can engage many convesations inside a session. Session is the container of many conversations. Engaging many conversations without a session that reference them don't make sens.

When you use s:link with a one argument method you're passing a reference to an obect but you don't post this object.

But I agree on the fact that it would be more helpful if we could have an error message like : this object could not be found in any scopes (similar to struts) than having the method executed with a null argument.

I can't figure out in wich situation a developper would write 


  | <s:link id="viewHotel" value="View Hotel" action="#{hotelBooking.selectHotel(hot)}"/>
  | 

and expecting "hot" to be null !




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