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Date: Wed, 27 Jul 2011 13:10:02 -0500
Message-ID: 
 <CAE9L6G2XCLw+hKv49=BFfpq7onrw5a3WER4fX=+Ah5983PBriQ@mail.gmail.com>
Subject: Re: An issue with converts and JSF2.0 CompositeComponents
From: Matt Benson <gudnabrsam@gmail.com>
To: MyFaces Discussion <users@myfaces.apache.org>
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Hi,
  This looks like https://issues.apache.org/jira/browse/MYFACES-2552
where I have noted my workaround.

HTH,
Matt

On Wed, Jul 27, 2011 at 1:00 PM, S. Bunge <sbungeml@nnga.de> wrote:
> Hi all,
>
> I got an issue using the composite components feature of jsf2.0.
> It's quite possible that I'm using the feature the wrong way.
>
> I created such component to combine a label and an h:inputText. If I use
> it with string objects all works fine but when I start to use instances o=
f
> custom classes and a converter registered in the faces-config.xml must
> handle the object, it fails.
>
> I use MyFaces 2.0.7 with a tomcat 6.0.32. I removed the label and other
> stuff in my example:
>
> My custom component (cc-ns: "http://java.sun.com/jsf/composite")
> ...
> <cc:interface>
> =A0<cc:attribute name=3D"id" required=3D"true" />
> =A0<cc:attribute name=3D"value" required=3D"true" />
> </cc:interface>
> <cc:implementation>
> =A0<h:inputText id=3D"inputText" value=3D"#{cc.attrs.value}" />
> </cc:implementation>
> ...
>
> I named the file 'myCC.xhtml' in /resources/myComponents/ so I can use it
> with ns-declaration:
> 'xmlns:my=3D"http://java.sun.com/jsf/composite/myComponents"' in my facel=
ets.
>
> I created also a bean named 'helloWorldBacking' with getMuh/setMuh and it
> returns an Object of Type 'Muh'. A converter is registered in the
> faces-config with 'converter-for-class' to handle the conversation betwee=
n
> view and model for the type.
>
> If I use <h:inputText id=3D"abc" value=3D"#{helloWorldBacking.muh}" />
> directly in my facelet it works like a charm. The converter is called and
> get/set is called with the right object in the update model phase. But if=
 I
> switch to the myCC-component I get an exception:
>
>> Caused by: javax.el.ELException: /resources/myComponents/myCC.xhtml at
>> line 17 and column 62 value=3D"#{cc.attrs.value}":
>> /helloWorld.xhtml at line 17 and column 71
>> value=3D"#{helloWorldBacking.muh}": Cannot convert asdfasd of type class
>> java.lang.String to class elproblem.Muh
>> =A0 =A0at
>> org.apache.myfaces.view.facelets.el.TagValueExpression.setValue(TagValue=
Expression.java:129)
>> =A0 =A0at
>> org.apache.myfaces.view.facelets.el.LocationValueExpression.setValue(Loc=
ationValueExpression.java:120)
>> =A0 =A0at javax.faces.component.UIInput.updateModel(UIInput.java:379)
>
> Maybe the behavior is slightly different with the used EL-library (I trie=
d
> jasper-el of the tomcat and EL2.2 of the glassfish) -- 'sometimes' it wor=
ks
> with none-null values the right way but if the bean returns 'null' if fai=
ls
> every time.
>
> My investigations came to a stop at following point:
> _SharedRendererUtils#findUIOutputConverter doesn't get the outer value
> binding of the composite component and can't determine the type. So no
> converter is called and he tried to update
> the model with a String.
> If I set the type to the cc:attribute it doesn't work. That would be a ba=
d
> solution anyway because the composite component must be abstract
> (otherwise I could call the right converter by id :-) )
>
> So my questions: Do I use the composite components feature the right
> way? If not: What is my fault? What are your suggestions?
>
> Thanks for your help,
> Sven
>