I had been getting a duplicate id error in my JSF app whenever I did a
postback. The stacktrace looks like:
java.lang.IllegalStateException: Client-id : _id5 is duplicated in the
faces tree.
at
org.apache.myfaces.application.jsp.JspStateManagerImpl.checkForDuplicateIds(JspStateManagerImpl.java:241)
at
org.apache.myfaces.application.jsp.JspStateManagerImpl.checkForDuplicateIds(JspStateManagerImpl.java:255)
at
org.apache.myfaces.application.jsp.JspStateManagerImpl.checkForDuplicateIds(JspStateManagerImpl.java:251)
at
org.apache.myfaces.application.jsp.JspStateManagerImpl.checkForDuplicateIds(JspStateManagerImpl.java:251)
at
org.apache.myfaces.application.jsp.JspStateManagerImpl.checkForDuplicateIds(JspStateManagerImpl.java:255)
at
org.apache.myfaces.application.jsp.JspStateManagerImpl.saveSerializedView(JspStateManagerImpl.java:204)
at
com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:471)
at
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:352)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:107)
As you can see from the stack trace, I am using MyFaces (v. 1.1.1),
Facelets (1.10). I kept eliminating code from the offending XHTML and
narrowed the problem down to the header facet inside a datatable:
<h:commandLink action="--Post back to this page using named link (not
just *null*)--" >Post back to this page</h:commandLink>
<t:datatable ...>
<t:column>
<h:facet name="header">
<h:panelGroup>A Header</h:panelGroup>
</h:facet>
Column Contents
</t:column>
</t:datatable>
Basically, if I changed:
<h:panelGroup>A Header</h:panelGroup> to <h:panelGroup id="someId">A
Header</h:panelGroup>
I no longer had the problem. Has anyone else experienced this problem?
I found a couple of JIRA issues that sounded similar to this problem,
but nothing concrete. Is this fixed in the latest release?
