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https://issues.apache.org/jira/browse/CXF-6561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14718421#comment-14718421
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Sergey Beryozkin commented on CXF-6561:
---------------------------------------

Hi, I was thinking about it and I reckon your code without any exception 
catches was actually better.
I remember now that the the reason AccessTokenService catches 
OAuthServiceException only and not other runtime exceptions is to let users 
throw something like WebApplicationException and handle that in their 
WebApplicationException mappers. I vaguely recall there was a user request 
where they wanted to throw WebApplicationException.

Therefore  ResourceOwnerGrantHandler catch blocks are indeed redundant and 
instead I need to tweak AccessTokenService a bit to make sure it lets 
WebApplicationExceptions flow further and handle other runtime exceptions 
locally.


> ResourceOwnerGrantHandler: ResourceOwnerLoginHandler can't return null or 
> throw exception
> -----------------------------------------------------------------------------------------
>
>                 Key: CXF-6561
>                 URL: https://issues.apache.org/jira/browse/CXF-6561
>             Project: CXF
>          Issue Type: Bug
>          Components: JAX-RS Security
>    Affects Versions: 3.1.2
>            Reporter: Karl von Randow
>            Assignee: Sergey Beryozkin
>             Fix For: 3.1.3, 3.0.7
>
>
> ResourceOwnerGrantHandler calls a customisable ResourceOwnerLoginHandler 
> instance, however the `createSubject(String, String)` method declares no 
> exceptions, and a null return value is not handled. This can possibly result 
> in the issuing of an access token if the DataProvider doesn't check for the 
> null subject.
> ResourceOwnerGrantHandler.createAccessToken(...) appears to expect that the 
> ResourceOwnerLoginHandler will throw an `Exception` (literally any 
> Exception), however the method signature of the ResourceOwnerLoginHandler 
> interface doesn't allow that.
> I will submit a pull request with a suggested fix.



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