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http://issues.apache.org/jira/browse/MYFACES-821?page=comments#action_12361210 
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Michael Lipp commented on MYFACES-821:
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Mmh, the problem is that I have looked into this more than a month ago, and as 
a lot has happened since, it is a bit hard to remember the details. I'm afraid, 
all I can do just now is point you to my code at 
http://cvs.sourceforge.net/viewcvs.py/wfmopen/wfmopen/src/de/danet/an/util/jsf/MyFacesAdaptedPortlet.java?rev=1.13&view=log

As far as the view-id is concerned: I have assumed that the view-id is a unique 
id for JSF model instances. If the view-id isn't, something else must be...

Regards,

    Michael


> Usage of request attributes for caching
> ---------------------------------------
>
>          Key: MYFACES-821
>          URL: http://issues.apache.org/jira/browse/MYFACES-821
>      Project: MyFaces
>         Type: Bug
>     Versions: 1.1.0
>  Environment: liferay 3.6.1
>     Reporter: Michael Lipp

>
> JspStateManagerImpl (and maybe other classes) uses request attributes for 
> caching state. This causes a wrong view to be used if there is more than one 
> JSF-based portlet on a single page. MyFaces saves the serialized view of the 
> first portlet on the page as a request attribute. To avoid re-serialization, 
> MyFaces subsequently checks if there already is a request attribute with a 
> serialized view. As request attributes are not scoped to a single portlet 
> (the portlet specification does not require this), the serialized view of the 
> first portlet will be found and used by the second portlet.
> This usage of request attributes may also be the cause of MYFACES-549.
> As JSF, of course, does not need to know about the portlet environment, it 
> cannot be required that MyFaces saves such information "per view", e.g. by 
> prepending the viewId to the key for the request attribute (although this 
> would solve the problem). IMHO any request attributes added during 
> lifecycle.render() should be removed after lifecycle() render by the portlet 
> bridge. (The same applies to request attributes added during 
> lifecycle.execute(), but these should also be re-added before 
> lifecycle.render().) I have implemented this in my portlet bridge as a 
> workaround.

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