Re: using saveState on non-managed bean?

[Roger Keays]

Hi Julian,
You should let a managed bean create your saveState bean. 

This is a bit difficult because the bean is polymorphic. The 
polymorphism drastically reduces the complexity of the code elsewhere in 
my app, so if I have to do a bit of extra work to create the bean then 
no problem :)

Thanks for your suggestions.

Roger

We use a managed
bean to do essentially what your converter is trying to do. Of course, you
have more lattitude using a managed bean than a converter to manipulate the
model :). You can also save the managed bean in the session (session scope)
which allows you to persist session-specific retrieval params for the object
store.

-----Original Message-----
From: news [mailto:[EMAIL PROTECTED] On Behalf Of Roger Keays
Sent: Saturday, May 20, 2006 7:27 AM
To: users@myfaces.apache.org
Subject: Re: using saveState on non-managed bean?



I'm trying to use t:saveState to make a bean available across several 
requests. Unfortunately it doesn't seem to work (I get a bean is null 
error after submitting the form) and AFAICT this is because saveState 
restores the bean by doing some magic with ValueBindings, and not 
directly manipulating the scope.


I didn't find out why the t:saveState tag wasn't working for me, although I
suspect it is because the ValueBinding had no way of knowing how to create
my bean.

I did come up with an interesting alternative though, and it also works for
non-serialized beans. My trick is to use a converter to fetch the bean from
the database and put it back into the request scope. I make the component
immediate to make sure my bean is in scope before any other conversions or
validations:

<h:inputText value="#{item}" converter="ItemRestorer" immediate="true"/>

public class ItemRestorer implements Converter {
   public String getAsString(...) {
     return ((Content) object).getUuid() + "");
   }

   public Object getAsObject(...) {
     object = fetch from db using uuid;
     requestMap.put("object", object);
     return object;
   }
}

This wouldn't work with non-persistent beans of course.

Roger


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Ninth Avenue Software
p: +61 7 3137 1351 (UTC +10)
f: +61 7 3102 9141
w: http://www.ninthavenue.com.au
e: [EMAIL PROTECTED]
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