Hi folks!

I faced strange behaviour when tried to display error page for all uncatched 
exceptions: sometimes error messages are displayed, sometimes I see empty error 
page and need refresh page to see messages.

My error page

  | <ui:composition template="/jspx/template.jspx"
  |                 xmlns="http://www.w3.org/1999/xhtml";
  |                 xmlns:ui="http://java.sun.com/jsf/facelets";
  |                 xmlns:s="http://jboss.com/products/seam/taglib";
  |                 xmlns:h="http://java.sun.com/jsf/html";
  |                 xmlns:f="http://java.sun.com/jsf/core";>
  |     <ui:define name="pageContent">
  |         <f:view>
  |             <h:form>
  |                 <p>
  |                     There has been an error.
  |                 </p>
  |                 <h:messages/>
  |             </h:form>
  |         </f:view>
  |     </ui:define>
  | </ui:composition>
  | 

Global exceptions handler declared in pages.xml

  |     <exception>
  |        <redirect view-id="/error.jspx">
  |             <message>
  |                 Unrecoverable error. If you edited some data then these 
have not been saved. Details: 
  |                 #{org.jboss.seam.handledException.message}
  |             </message>
  |        </redirect>
  |     </exception>
  | 

Seam debug mode and facelet development mode are disabled.

How I tested: Open form and enter duplicate value to unique field, JDBC driber 
throws ConstraintViolation exception, it successfully propagated to declared 
handler, it successfully adds error message to FacesMessages.instance(), and 
redirects to error.jspx BUT when page opens I sometimes  do not see messages 
and need to refresh page.

Looks like there is some racing between handled exception processing and next 
page rendering - sometimes messages are added BEFORE page rendered and all is 
ok, sometimes page rendered BEFORE messages added and I need refresh.

Under debugger all works fine (as I understand my breakpoints suspends page 
rendering so there is no racing).

What to do?

Thanks in advance!

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