Question about PrepareInterceptor and Preparable

[Oscar]

Hi to all. I'm developing a Struts 2 application and i create an 
interceptor to initialize values and to validate user login. I want to 
load a list to jsp to populate a s:select so i implemented the 
Preparable interface in my action, and the method prepare(), so i type 
the code in this method to get the list from DB. For that i supposed 
that my custom interceptor will execute before the prepare method 
because in my interceptor i initialize my connection that i use on 
prepare(), but perpare() executes before that, so it gives me a 
NullPointerException.

Then i googled about it and i found something about PrepareInterceptor, 
so i defined in my interceptor stack after my own interceptor, like this:

<interceptor-stack name="appInteceptors">
<interceptor-ref name="initializeInterceptor" />
               <interceptor-ref name="prepare" />
               <!--<interceptor-ref name="permissionsInterceptor" />-->
               <interceptor-ref name="defaultStack" />
</interceptor-stack>

But it doesn't work, because i tought that with the order change my 
interceptor will execute before than action's prepare() method, but don't.

Somebody knows how to execute prepare() after a custom interceptor 
execution?

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