Re: Problem with the getAsObject of a Converter

[Kostas Karadamoglou]

No! the same problem, nothing changed.
I am so desperate :(

Heath Borders wrote:

Do this:

private Converter myConverter = new MyConverter();

public Converter getMyConverter()
{
return myConverter;
}

then, converter="#{myBean.myConverter}" in your jsp.

On Fri, 18 Mar 2005 18:13:51 +0000, Kostas Karadamoglou
<[EMAIL PROTECTED]> wrote:

How? I didn't understand it. Can you please give me an example?
Heath Borders wrote:

Here's another option.  Rather than making the converter a faces
managed bean, you can make it an instance variable of yoru event
handler.  Try that and see if it works better.

On Fri, 18 Mar 2005 17:30:41 +0000, Kostas Karadamoglou
<[EMAIL PROTECTED]> wrote:

Couldn't it be consindered as a bug?
Does anyone eles have the same problem?

Heath Borders wrote:

oh.  Sorry I misunderstood your first email.

That means that there's something wrong with the selectOneMenu or something.

On Fri, 18 Mar 2005 16:22:42 +0000, Kostas Karadamoglou
<[EMAIL PROTECTED]> wrote:

Yes but how can JSF call the getAsObject method of the converter with
the str parameter equals to null !!!

I checked the generated code and the all the option tags in the drop
down menu have a value ("1","2","3","4","5" and so on)
So how jsf returns a null string? thats the problem. :(
Heath Borders wrote:

No, you don't want to do that.  Otherwise, the category object will
not be properly set in his setter.  The problem is definitely with
your converter.  My guess is that its getting re-created between
requests, and thus the map is getting cleared.  I couldn't tell you
why that's happening, though.

On Fri, 18 Mar 2005 11:05:23 -0500, Srikanth Madarapu
<[EMAIL PROTECTED]> wrote:

Can you try

this.allCategories.add(new SelectItem(category.getId(),  category.getTitle()));

The getId() method should return the same value as returned by getAsString(). I 
think there is some problem...

Srikanth

-----Original Message-----
From: Kostas Karadamoglou [mailto:[EMAIL PROTECTED]
Sent: Friday, March 18, 2005 10:56 AM
To: MyFaces Discussion
Subject: Re: Problem with the getAsObject of a Converter

Hi, I attached the getter of allcategories, as you can see I return a
list of selectItem objects

public List getAllCategories(){
   if(this.allCategories==null){
       this.allCategories=new ArrayList();
       this.allCategories.add(new SelectItem(new Category(),"Choose
a category..."));
       List categories=this.eventRegistry.getCategories();
       for(Iterator iter=categories.iterator(); iter.hasNext();){
           Category category=(Category)iter.next();
           this.allCategories.add(new SelectItem(category,
category.getTitle()));
       }
   }
   return this.allCategories;
}

Srikanth Madarapu wrote:

What is the return type of allCategories ?

The list coming from allCategories should be a list of "SelectItem" objects, I 
think in yours case its just a list of Strings

-Srikanth

-----Original Message-----
From: Kostas Karadamoglou [mailto:[EMAIL PROTECTED]
Sent: Friday, March 18, 2005 9:17 AM
To: myfaces-user@incubator.apache.org
Subject: Problem with the getAsObject of a Converter

Hi again!!!

I have another problem now, Very strange Can you suggest me a solution?

I created a converter for objects of type Category in order to display
some Category beans in a selectOneMenu tag.

I have debuged the application and I noticed a strange behaviour of JSF
which I cannot understand.
Below I have the sequence explanation of the problem and the content of
each method and jsp fragment.

1)The getAsString method works perfectly and returns the following
strings "0","1","2","3","4","5","6","7"

2)The page is displayed properly, and I choose from the drop down menu a
category.

2)Afterwords JSF invokes getAsObject (I think for the chosen option)
with the str parameter null !!!!!!!
In this situation I return a null object (which is wrong).

4)After that  when the page is redisplayed the getAsString throw an
Exception because of the null value

JSP-------------------------------------------------------
<h:selectOneMenu id="selectCategory"
converter="#{categoryConverter}" value="#{eventHandler.selectedCategory}">
   <f:selectItems id="allCategories"
value="#{eventHandler.allCategories}"/>
</h:selectOneMenu>

getAsString------------------------------------------------

public String getAsString(FacesContext facesContext, UIComponent
uIComponent, Object obj) throws ConverterException {
   String retValue=null;
   if(obj==null)
       throw new ConverterException("not null object of type
Category expected");
   else if(obj instanceof Category){
       Category category=(Category)obj;
       map.put(new Integer(category.getId()), category);
       retValue=String.valueOf(category.getId());
   }else{
       throw new ConverterException("object of type Category
expected received: "+obj.getClass().getName()+"="+obj.toString());
   }
   return retValue;
}

getAsObject------------------------------------------------

public Object getAsObject(FacesContext facesContext, UIComponent
uIComponent, String str) throws ConverterException {
   Category retValue=null;
   if(str!=null){
       try{
           System.out.println(str);
           Integer id=Integer.valueOf(str);
           retValue=(Category)map.get(id);
       }catch(Exception ex){
           throw new ConverterException("a number formatted string
expected");
       }

   }else{
       //throw new ConverterException("a not null string expected");
       return null;
   }
   return retValue;
}