[PROPOSAL] Add Exception Handling to ActionForwards

[David Graham <dg...@hotmail.com>]

I'll start with a specific situation:
Tiles allows you to configure a Controller class on a tile that gets 
executed whenever that tile gets used.  This is most commonly used to 
prepare data for the tile from some datasource.  However, the declarative 
exception handling feature does not apply to this, rendering this Tiles 
feature fairly useless.

The general feature idea:
The problem is that the RequestProcessor only invokes the exception handling 
mechanism on an Action's execute() method.  If we extended this idea to 
handling exceptions from ActionForwards we could allow implementations to 
report errors that occurred while forwarding and allow applications to 
recover gracefully.  As it is, I think a ServletException get propagated up 
to the servlet.

I believe the changes would include changing
RequestProcessor.processForwardConfig() throws IOException, ServletException

to

RequestProcessor.processForwardConfig() throws Exception

and the 2 places that processForwardConfig() is called in RequestProcessor 
would catch the Exception and pass it to processException().

Thoughts?
David







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