[Hawkular-dev] [metrics] Consistent error replies from REST API

[Juraci Paixão Kröhling]

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On 03/06/2015 10:57 AM, Heiko W.Rupp wrote:
> We should all over the place
> 
> a) specifc exceptions for some of the more common cases like
> StuffNotFoundException(message)
> 
> b) add Exception mappers that deal with mapping that exception
> content to some sensible output depending on requested media type.

I think we should be a bit careful with blindly throwing exceptions
and mapping them to responses. Exceptions are more expensive than just
checking for an object's existence and, for a public service (SaaS),
this could be abused.

For scenarios where things were really expected to be there but
aren't, exceptions are fine. For scenarios where the user asked for
something that didn't exist, input checking and promptly returning a
404 makes more sense, IMO.

- - Juca.
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