ExecuteAndWait interceptor position?

[Igor Vlasov <vi...@mail.ru>]

Hello.

In Struts Documentation i found that 
"Because of the nature of this interceptor, it must be the last interceptor
in the stack."

and in struts-default.xml i found 

<interceptor-stack name="executeAndWaitStack">
  <interceptor-ref name="execAndWait">
      <param name="excludeMethods">input,back,cancel</param>
   </interceptor-ref>
   <interceptor-ref name="defaultStack"/>
   <interceptor-ref name="execAndWait">
      <param name="excludeMethods">input,back,cancel</param>
   </interceptor-ref>
</interceptor-stack>

Why it appears twice?  Before all interceptors and after all interceptors.

In other parts of documentation  i see than i must use:    
<interceptor-ref name="defaultStack"/>
<interceptor-ref name="execAndWait"></interceptor-ref>

-  an execAndWait interceptor as last interceptor.

Why we need configured executeAndWaitStack?



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