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https://issues.apache.org/jira/browse/MYFACES-2142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12704714#action_12704714
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Curtiss Howard commented on MYFACES-2142:
-----------------------------------------
Leonardo, I found the text in the spec that talks about this. Section 2.2.6,
last bullet:
"For partial requests, where partial view rendering is required, there must be
no content written outside of the view
(outside f:view). Response writing must be disabled. Response writing must be
enabled again at the start of
encodeBegin."
And I think it's better to extend HttpServletResponseWrapper because otherwise
you have to implement all the methods in HttpServletResponse and back them with
an existing writer... effectively duplicating the functionality of
HttpServletResponseWrapper.
> ClassCastException in JspViewHandlerImpl: ResponseSwitch !=
> HttpServletResponse
> -------------------------------------------------------------------------------
>
> Key: MYFACES-2142
> URL: https://issues.apache.org/jira/browse/MYFACES-2142
> Project: MyFaces Core
> Issue Type: Bug
> Components: JSR-314
> Reporter: Jan-Kees van Andel
> Attachments: MYFACES-2142.patch
>
>
> While running the latest myfaces2 source code with a test JSP page, I've
> encountered the following error.
> java.lang.ClassCastException:
> org.apache.myfaces.context.servlet.ResponseSwitch cannot be cast to
> javax.servlet.http.HttpServletResponse
> at
> org.apache.myfaces.application.jsp.JspViewHandlerImpl.buildView(JspViewHandlerImpl.java:487)
> at
> org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:343)
> at
> org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:45)
> at
> org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:167)
> at
> javax.faces.webapp.FacesServlet._handleStandardRequest(FacesServlet.java:428)
> at javax.faces.webapp.FacesServlet.service(FacesServlet.java:182)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> etc......
> As far as I can see, this is a bug, since there is an explicit cast to
> HttpServletResponse and the given parameter is of type ResponseSwitch, which
> is not a HttpServletResponse.
> It looks like a recent change...
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