when used in modules, TilesPreProcessor not backwards compatible with 1.2.x 
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         Key: STR-2879
         URL: http://issues.apache.org/struts/browse/STR-2879
     Project: Struts Action 1
        Type: Bug

  Components: Tiles  
    Versions: 1.3.4    
    Reporter: Joe Germuska
     Fix For: 1.3.5


When used in any "module" other than the "root" (or default), the 
implementation of TilesPreProcessor does not work in the same way that the 
TilesRequestProcessor did in earlier versions of Struts.

Specifically, because it does not dispatch the forward itself, it leaves the 
"module" unarticulated; this causes PerformForward to attempt to resolve the 
base Tiles JSP (or other path) relative to the current module, which is not how 
it used to be.

I think the best solution would be for the TilesPreProcessor to actually do the 
requestDispatcher.forward() (or include) in cases where it finds that the 
working ForwardConfig is for a tile definition, rather than returning a 
ForwardConfig.  It can return "true" to signal that the chain should end.

The only argument against this would be if people thought they'd want to add 
more chain logic after the TilesPreProcessor.  I suppose it could set the 
ForwardConfig to null and let the chain continue.

I'd love some opinions on this, and it'll be a couple of days before I could do 
a fix, so please weigh in if you have any.  Also, module users are encouraged 
to step up and help clarify, as I only use them under protest :) 

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