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From "Olaf Fricke (JIRA)" <...@myfaces.apache.org>
Subject [jira] Commented: (MYFACES-1531) Incorrect handling of FacesContext
Date Fri, 02 Mar 2007 10:37:50 GMT

    [ https://issues.apache.org/jira/browse/MYFACES-1531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12477254
] 

Olaf Fricke commented on MYFACES-1531:
--------------------------------------

Hi David,

thanks for your help.

But your suggestions does not help us, because the listener is already running for our portlets.
BTW, you do not have to register th elistener in your web.xml explicitly if working with MyFaces
1.4 -- the listener will be registered automatically, because it is configured in META-INF/myfaces_core.tld.

Best regards,
Olaf


> Incorrect handling of FacesContext
> ----------------------------------
>
>                 Key: MYFACES-1531
>                 URL: https://issues.apache.org/jira/browse/MYFACES-1531
>             Project: MyFaces Core
>          Issue Type: Bug
>    Affects Versions: 1.1.4
>         Environment: WindowsXP & Solaris; Tomcat 5.5.17, Liferay 4.2.0 (Portal Server)
>            Reporter: Olaf Fricke
>
> We encountered some NPE when accessing the FacesContext in the doView-Method. I first
thought about a bug in the Liferay-Portal-Server (see http://support.liferay.com/browse/LEP-1869).
But then I discovered that it is a bug in MyFaces, that is triggred because Liferay pools
ActionRequest and RenderRequest objects.
> MyFaces changes the external context value in the method org.apache.myfaces.portlet.MyFacesGenericPortlet#facesRender
to switch from ActionRequest and ActionResponse to RenderRequest and RenderResponse. But that
switch happens to late, so that in doView (and doEdit and doHelp as well) the FacesContext
uses references to the ActionRequest and ActionResponse instead of RenderRequest and RenderResponse.
And unfortunately Liferay has already recycled the RenderRequest object and thus a NPE is
raised when trying to use the request.
> I added the following code to my portlet (indeed, to our own super class) to make the
switch earlier and the NullPointerException when accessing attributes via the FacesContext
will not be raised any longer. (Please note that I cannot use the FacesContext.getCurrentInstance()
method in a portal environment, because each portlet owns its own context).
>     public void render(RenderRequest request, RenderResponse response) throws PortletException,
>             IOException {
>         // The following code was taken from org.apache.myfaces.portlet.MyFacesGenericPortlet#facesRender
>         //
>         // get the portlet session local context
>         ServletFacesContextImpl context = (ServletFacesContextImpl) request.getPortletSession()
>                 .getAttribute(CURRENT_FACES_CONTEXT);
>         if (context != null) {
>             // and set a new external context that uses the render request and response
>             context.setExternalContext(makeExternalContext(request, response));
>         } else {
>             // no context available for the current portlet yet; create a new one and
put it into the session
>             context = (ServletFacesContextImpl) facesContext(request, response);
>             request.getPortletSession().setAttribute(CURRENT_FACES_CONTEXT, context);
>         }
>         super.render(request, response);
>     } 
> Later I discovered another problem concerning the FacesContext: When rendering the very
first MyFaces-Portlet, no FacesContext exists for the Portlet. Therefore the method nonFacesRequest
is called. Somewhere inside this method a new FacesContext is created, but that new FacesContext
is never put into the session. Thus my workaround in the render method was broken again. I
fixed that by extending the method nonFacesRequest as follows:
>     protected void nonFacesRequest(RenderRequest request, RenderResponse response)
>             throws PortletException {
>         super.nonFacesRequest(request, response);
>         request.getPortletSession().setAttribute(CURRENT_FACES_CONTEXT,
>                 FacesContext.getCurrentInstance());
>     }

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