Generating conversion errors

Hello,

I've got a custom converter similar to the one in WebWork in Action that converts between domain objects and their IDs.  If I enter an invalid ID, i.e. one that doesn't exist or a non-integer string, the converter just returns null.  I had thought that returning null or returning the original value would cause WebWork to generate a conversion error, but no luck.  So, the property of my action just winds up being null, which triggers a my required validator, but I want to be able to distinguish between a conversion error and the required validation error.  Should it do something other than return null or the original value?  Throw an exception or something?

Thanks,
Rich
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