Thomas Watson commented on FELIX-5782:

+1 to creating an enum Reason and single exception type.  I think this is more 
likely to be how we would do it for the specification if we want to push for it 

> allow resolver errors to be introspected
> ----------------------------------------
>                 Key: FELIX-5782
>                 URL: https://issues.apache.org/jira/browse/FELIX-5782
>             Project: Felix
>          Issue Type: Improvement
>          Components: Resolver
>            Reporter: Raymond Augé
>            Assignee: Thomas Watson
>            Priority: Minor
> The current model for resolver errors does not provide any means of 
> introspecting deeper knowledge that the resolver gained. The information is 
> internal only, which makes user feedback more difficult to produce than 
> necessary.
> I propose to expose the error types by means of an exported package 
> {{org.apache.felix.resolver.error}}. This will allow interested clients to 
> dig more deeply into the reasons for resolution failure in order to provide 
> better feedback to users.

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