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https://issues.apache.org/struts/browse/SHALE-418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44735#action_44735
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payne commented on SHALE-418:
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> Exception "Client-id : _id0 is duplicated in the faces tree" occurs with
> MyFaces 1.1.1
> --------------------------------------------------------------------------------------
>
> Key: SHALE-418
> URL: https://issues.apache.org/struts/browse/SHALE-418
> Project: Shale
> Issue Type: Bug
> Components: Clay
> Affects Versions: 1.0.4
> Reporter: Richard W. Eggert II
> Assignee: Gary VanMatre
> Fix For: 1.0.5
>
>
> From mailing list discussion with Gary VanMatre:
> >From: "Richard Eggert" <[EMAIL PROTECTED]>
> >
> > I'm running into a problem using "Xml views" using HTML templates. Loading a
> > page initially works fine, but if I reload the page either by clicking on a
> > link
> > or hitting Refresh, I get the following error.
> >
> >
> > java.lang.IllegalStateException: Client-id : _id0 is duplicated in the faces
> > tree.
> > at
> > org.apache.myfaces.application.jsp.JspStateManagerImpl.checkForDuplicateIds(JspS
> > tateManagerImpl.java:241)
> > at
> > org.apache.myfaces.application.jsp.JspStateManagerImpl.checkForDuplicateIds(JspS
> > tateManagerImpl.java:255)
> > (the above line is repeated several times)
> > at
> > org.apache.myfaces.application.jsp.JspStateManagerImpl.savedSerializedView(JspSt
> > ateManagerImpl.java:204)
> > at
> > org.apache.shale.clay.faces.ClayViewHandler.renderView(ClayViewHandler.java:418)
> > ...
> >
> > The error goes away if I load the page again, and then comes back if I load
> > the
> > page again after that.
> >
> > I created a very simple test page to reproduce the problem:
> >
> > bugTest.html
> > ---------------
> ><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN">
> ><html>
> > <head>
> > <title>Testing</title>
> > <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
> > <meta http-equiv="pragma" content="no-cache">
> > <meta http-equiv="cache-control" content="no-cache">
> > <meta http-equiv="expires" content="0">
> > </head>
> > <body>
> > foo
> > </bod y>
> ></html>
> >
> >
> >
> >
> > clay-views.xml (excerpt)
> > ----------------------------
> >
> ><component jsfid="/bugTest.clay" extends="clay">
> > <attributes>
> > <set name="clayJsfid" value="/path/to/bugTest.html" />
> > </attributes>
> ></component>
> >
> > (web.xml maps *.clay to the Faces servlet and the Shale application filter)
> >
> > I don't know if this is a bug in MyFaces (I'm using version 1.1.1), a bug in
> > Clay, or if I'm doing something wrong, but I've never seen this problem
> > before
> > with my other (non-Clay-based) pages. Any ideas?
> >
> Darn, I thought we had this one covered for all the releases but I must not
> have tested again with myfaces 1.1. There is some history with this issue.
> This has to do with how the view root generates component ids. For components
> that you don't explicitly assign a component id, there is a utility function
> on the view root to generate a unique Id. In the first versions of Myfaces
> and the RI, the internal sequence that generates the ids was always reset
> even after the view was restored.
> This is a significant because of components marked transient. Transient
> components do not save state in the view. The "verbatim" component is actual
> an outputText with the transient property tunned on. When the view is
> restored, we have to recreate transient components and these components will
> need generated component id's since this is just text. In the early version
> of clay, after the view was restored, we would generate, in sequence,
> component ids for all components including components that were restored
> because this counter was always reset. A clay html template contains allot of
> transient components because the entire template is defined using components
> (Thanks again to Manfred Klug who helped figure this all out). Interesting
> enough, making all the view represented by components is the same approach
> they took in JSF 1.2.
> The EG team determined that reseting the counter was a "bug". The view root
> should restore the internal counter. Starting with version 1.1.2, myfaces
> changed the view roots to restore the counter.
> Clay Release 1.0.3
> http://issues.apache.org/struts/browse/SHALE-195
> The counter being reset made PPR or any changes to a restored component tree
> problematic. So, in JSF 1.2 they changed how component id's are generated.
> They are now generated by the the container for JSP tags implementing
> JspidConsumer (JSP 2.1). The JspidConsumer will always return the same id for
> a component.
> Most recently, changes were made in this area to allow Clay to work with JSF
> 1.2.
> Clay Release 1.0.4
> http://issues.apache.org/struts/browse/SHALE-67
> I thought that I had this covered for all releases but it sounds like it's an
> issue. Trying to play with all versions is challenge. I'd like to move the
> trunk to full JSF 1.2 support and leave the 1_0_X branch for JSF 1.1 flavors.
> There are features in JSF 1.2 that we can not support until we commit to the
> new EL API.
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