[PROPOSAL] Add Exception Handling to ActionForwards

[David Graham]

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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