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https://issues.apache.org/jira/browse/MYFACES-4623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17755339#comment-17755339
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Volodymyr Siedlecki commented on MYFACES-4623:
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c:forEach has given us lots of problems in the past (such as MYFACES-4318).
However, the code you found above was added in MYFACES-3883 and it looks like
work around: " The idea is detect the duplicate when the component is added to
the tree and remove the invalid component and replace it with the restored
one."
I stepped through the code and saw the jakarta.faces.component.UIOutput was not
"MARK_CREATED", so the duplicate entry was added as a child of the
ComponentResourceContainer target. I can try to look a bit further into this
(perhaps find a way to mark the component), but I'm not sure if we are able to
fix as it looks like PSS and c:forEach are a bit broken when used together.
> DuplicateIdException when adding component with resource in JSTL tag handler
> ----------------------------------------------------------------------------
>
> Key: MYFACES-4623
> URL: https://issues.apache.org/jira/browse/MYFACES-4623
> Project: MyFaces Core
> Issue Type: Bug
> Components: General
> Affects Versions: 4.0.1
> Reporter: Manuel K
> Priority: Major
>
> The following error occurs when a JSF component adding a resource is added in
> a JSTL tag handler:
> {code:java}
> org.apache.myfaces.view.facelets.compiler.DuplicateIdException: Component
> with duplicate id "j_id__rd_5" found. The first component is {Component-Path
> : [Class: jakarta.faces.component.UIViewRoot,ViewId: /test.xhtml][Class:
> org.apache.myfaces.component.ComponentResourceContainer,Id:
> jakarta_faces_location_head][Class: jakarta.faces.component.UIOutput,Id:
> j_id__rd_5]}
> at
> org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtils.createAndQueueException(CheckDuplicateIdFaceletUtils.java:139)
> at
> org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtils.checkIds(CheckDuplicateIdFaceletUtils.java:95)
> at
> org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtils.checkIds(CheckDuplicateIdFaceletUtils.java:109)
> at
> org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtils.checkIds(CheckDuplicateIdFaceletUtils.java:103)
> at
> org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtils.checkIds(CheckDuplicateIdFaceletUtils.java:81)
> at
> org.apache.myfaces.view.facelets.PartialStateManagementStrategy.saveView(PartialStateManagementStrategy.java:701)
> at
> jakarta.faces.application.StateManager.getViewState(StateManager.java:147)
> [...]{code}
> In our example, the resource that is apparently added to the component tree
> twice is _inputmask/inputmask.js_ of the _p:calendar_ component when using it
> in a {_}c:forEach{_}.
> The error only happens if _STRICT_JSF_2_FACELETS_COMPATIBILITY_ is enabled,
> but that is a requirement for our application. The error does not occur in
> Mojarra.
> I would appreciate you looking into this, as it is a pretty big problem for
> us. And before you ask: We're using c:forEach because in our application
> changing from c:forEach/c:if to ui:repeat/ui:fragment would result in an
> increase of components in the component tree by a factor of about 5 on some
> sites.
> I could copy and paste more of the code here, but I think it's easier to just
> look at the reproducer:
> [https://github.com/mkomko/primefaces-test/tree/inputmask-duplicateid]
> The error occurs when opening the dialog using the button and then clicking
> "Cancel".
> Thank you very much in advance!
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