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  1. FacesServlet.service() has thrown an IllegalStateException
    JavaServer Faces
    1
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    0
  2. AjaxStateManager.buildViewState() has thrown an IllegalStateException
    Unsorted
    1
    0
    0

Your stack trace compared to the selected pattern

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java.lang.IllegalStateException: duplicate Id for a component j_id2:cat
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    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)

External results for this pattern (2)

  1. Charles Crouchvia https://bugzilla.redhat.com/bugzilla/2 years ago
    duplicate Id for a component _viewRoot:status
    Show stack trace
  2. duplicate Id for a component j_id2:cat
    Show stack trace