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From "dennis hoersch (JIRA)" <...@myfaces.apache.org>
Subject [jira] [Created] (MYFACES-3702) ui:repeat is caching its data model if error occurs
Date Fri, 08 Mar 2013 14:42:16 GMT
dennis hoersch created MYFACES-3702:
---------------------------------------

             Summary: ui:repeat is caching its data model if error occurs 
                 Key: MYFACES-3702
                 URL: https://issues.apache.org/jira/browse/MYFACES-3702
             Project: MyFaces Core
          Issue Type: Bug
    Affects Versions: 2.1.10
            Reporter: dennis hoersch


ui:repeat caches its data model. Usually it it is cleared before rendering. But not if there
are any errors in faces context. 

Why is it not cleared then?

That causes a problem in the following scenario:

We have an ui:repeat that iterating over a list of more detailed error messages of an object
on the page. This list is empty in the start of an request. While invoking an action on the
page error messages are added to the faces context to be shown on the page. Additionally some
more detailed information is stored to be shown directly with that object.

But they won't appear because the empty list is cached in the ui:repeat's data model.


I could reproduce it with the following more general example: The first button creates an
info message which will be shown by the ui:repeat. The second button creates an error message
and nothing is rendered through the ui:repeat.

Testpage.xhtml

<his:form id="testForm">
  <h:commandButton value="Create info message" action="#{testController.createInfoMessage()}"
/>
  <h:commandButton value="Create error message" action="#{testController.createErrorMessage()}"
/>
  <br/>

  UI:Repeat:
  <ui:repeat var="item" value="#{facesContext.getMessageList()}">
    FacesMessage #{item.severity} // #{item.summary}
  </ui:repreat>|<br/>

  Has Messages: #{not empty facesContext.getMessageList()}|
</his:form>

TestController

public void createErrorMessage() {
  MessageUtils.addMessage(FacesMessage.SEVERITY_ERROR, "Oh no, an error!", new Object[] {});
}

public void createInfoMessage() {
  MessageUtils.addMessage(FacesMessage.SEVERITY_INFO, "Just an information.", new Object[]
{});
}


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