AW: Re: [Shale] Property in ViewController Backing Bean is null

[Peter Götz]

Hi Jason, 

I'm a real newbie to JSF and Shale, but maybe the tip that Craig gave me about 
setting the immediate flag in the commandbutton could help you. Then validation 
is skipped, as far as I understood it. This helped me with my first problem. 
Maybe you can use it, too. 

Then you could remove the H. :)

Greetings, 

Peter



I think you may running into a simular problem that I ran into.

I have the following scenario: page 1 has the user choose from a list
of options.  On page 2, the form saves the selected option of page 1
in a hidden field in its form.  In addition the selected value from
page 1 is used to populate a pull down on page 2.  So the user hits
the submit button on page 2 to save the changes and KA-BLAMMO, I get a
NPE.

What was happening was the JSF was attempting to Validate the pulldown
values in the Validation phase.  This was before any of the hidden
fields were set.  So because the hidden fields weren't set, the
retrieve of the pulldown was failing.

I saw 1 of 2 solutions:
1) Turn off the validation of the pulldown.  Because, hey... why would
I need to validate a pulldown? - it isn't like a user can mistype
something.
OR
2) somehow get the hidden fields to be set before any retrieval of the
pulldown is made.

The JSF mailing list from Sun gave no help for turning off the
validator for the pulldown.

So I had to do the following, for which I give myself a big Capital
H for HACK.  In the contructor of the backing bean, I grabbed the
request parameters myself and called the setters from there for the
values that were needed to get through the validation of the pulldown.

Perhaps someone here can help turn off the need to retrieve the
pulldown values in the validation phase.

I hope this will help your situation, as well.

Cheers,
Jason




On 2/14/06, Gary VanMatre [EMAIL PROTECTED] wrote:
 From: Peter Goetz [EMAIL PROTECTED]
 
  Hi again,
 
  I tried the whole weekend, but I didn't get any results other than those
  mentioned in the email below.
  Shall I send some code to illustrate the problem or is it really so
  unusual, what I'm trying to do?
 

 Make sure that you have a navigation rule setup to handle the immediate 
command button.  Try adding a rule that directs you to the target viewid 
(sounds like the page you are submitting from).  If you don't have a 
navigation case, I think the veiw is just restored using the submitted 
values.

  navigation-rule
 from-view-id/somepage.jsp/from-view-id
 navigation-case
   from-outcomeedit/from-outcome
   to-view-id/somepage.jsp/to-view-id
 /navigation-case
   /navigation-rule


  Thanks a lot for any help!
 
  Peter

 Gary


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AW: Re: [Shale] Property in ViewController Backing Bean is null

[Peter Götz]

Hello Gary!



 [...] 

Make sure that you have a navigation rule setup to handle the immediate 
command button.  Try adding a rule that directs you to the target viewid 
(sounds like the page you are submitting from).  If you don't have a 
navigation case, I think the veiw is just restored using the submitted values. 


 navigation-rule
from-view-id/somepage.jsp/from-view-id
navigation-case
  from-outcomeedit/from-outcome
  to-view-id/somepage.jsp/to-view-id
/navigation-case  
  /navigation-rule


I tried your tip yesterday and it seems to do the trick. Thank you very much!
Until then my action methods were void, because I didn't know that you have to 
have navigation to get the jsf reloaded complete. I thought Well, it's being 
reloaded, so everythings all right. 

I will try this further tonight at home, but I think that was the missing link 
for me to get really startet with Shale. 

Thanks a lot and keep up the good work here, I really start to like Shale. 


Peter

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