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From Allen Gilliland <>
Subject problems with file upload parameters and custom interceptor stack
Date Thu, 17 May 2007 19:58:53 GMT
i am having a strange problem with doing file uploads using a custom 
interceptor stack.  basically, if my custom interceptor stack does not 
directly reference the defaultStack then i am not getting request 
parameters from my multipart requests.  the easiest way to describe it 
is by showing.

using this stack my action is properly getting request parameters set ...

	<interceptor-stack name="shorterRollerStack">
                 <interceptor-ref name="defaultStack" />

                 <!-- custom Roller interceptors -->
                 <interceptor-ref name="UIActionInterceptor"/>
                 <interceptor-ref name="UISecurityInterceptor"/>
                 <interceptor-ref name="UIActionPrepareInterceptor"/>


however, using this stack my action does not get it's request parameters 
properly set ...

	<interceptor-stack name="rollerStack">
                 <interceptor-ref name="exception"/>
                 <interceptor-ref name="alias"/>
                 <interceptor-ref name="servlet-config"/>
                 <interceptor-ref name="prepare"/>
                 <interceptor-ref name="i18n"/>
                 <interceptor-ref name="chain"/>
                 <interceptor-ref name="debugging"/>
                 <interceptor-ref name="profiling"/>
                 <interceptor-ref name="scoped-model-driven"/>
                 <interceptor-ref name="model-driven"/>
                 <interceptor-ref name="fileUpload"/>
                 <interceptor-ref name="checkbox"/>
                 <interceptor-ref name="static-params"/>
                 <interceptor-ref name="params">
                   <param name="excludeParams">dojo\..*</param>
                 <interceptor-ref name="conversionError"/>

                 <!-- custom Roller interceptors -->
                 <interceptor-ref name="UIActionInterceptor"/>
                 <interceptor-ref name="UISecurityInterceptor"/>
                 <interceptor-ref name="UIActionPrepareInterceptor"/>

<!-- validation interceptors -->
<interceptor-ref name="validation">
   <param name="excludeMethods">input,back,cancel,browse</param>
<interceptor-ref name="workflow">
   <param name="excludeMethods">input,back,cancel,browse</param>


so the use case would be that if i posted a multipart request to my 
action url with parameters like "?weblog=foo" plus the file upload 
params then my action should have setWeblog() called.  this works 
properly for the first interceptor stack but not the second :/

i am trying to use the second stack which is basically the same thing as 
the first one except that i had to copy what was in the defaultStack so 
that i could insert my custom interceptors before the validation 
interceptors.  And I should note that I am looking for the value of my 
parameter in the UIActionInterceptor, so I am looking for the value 
before the validation and workflow interceptors are processed, not 
inside my action method.

so why doesn't the second stack properly set my request parameters on my 
action?  i wouldn't think that the validation interceptors have anything 
to do with parameter setting so it shouldn't matter that they are placed 
after my custom interceptors.

-- Allen

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