duplicate id exception with JSTL conditional tag
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Key: MYFACES-1708
URL: https://issues.apache.org/jira/browse/MYFACES-1708
Project: MyFaces Core
Issue Type: Bug
Components: General
Affects Versions: 1.1.5
Environment: JDK 1.5.0_12-b04/Linux amd64 or JDK 1.5.0_07-87/MacOS X,
Tomcat 5.5.17
Reporter: Kenji Nagahashi
It might have been better to reopen MYFACES-603, but observed behavior is
slightly different.
I'm using JSTL's <c:if> to dynamically change view component tree depending on
application state. This consistently results in duplicate id exception in
JspStateManagerImpl.checkForDuplicateIds(). I have been thinking it's a bad
thing to do, but I may have found a problem in MyFaces.
UIComponentTag.removeFormerChildren method removes former children not seen
during rendering. It uses UIComponent.findComponent() for looking up children,
but the method returns a child of other UIComponent under certain situations -
specifically when two UIComponents have the same id due to changed
automatically-assigned IDs. So former UIComponent incorrectly remains in the
view tree, causing duplicate id exception.
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