Colm O hEigeartaigh closed CXF-6480.

> InjectionUtils createThreadLocalServletApiContext better error message for 
> invalid @Context classes
> ---------------------------------------------------------------------------------------------------
>                 Key: CXF-6480
>                 URL: https://issues.apache.org/jira/browse/CXF-6480
>             Project: CXF
>          Issue Type: Bug
>          Components: JAX-RS
>            Reporter: Ravi Luthra
>            Assignee: Sergey Beryozkin
>            Priority: Trivial
>             Fix For: 3.0.6, 2.7.17, 3.1.2
> When you have an \@Context field in a JAXRS class (maybe JAXWS too?) there is 
> a select list of possible proxy classes. This method checks for the proxy 
> class using an if/else/if/else... structure, but there is no final else 
> clause with a good exception. Instead the method attempts to instantiate a 
> null class name (proxyClassName), which throws a NullPointerException. This 
> leaves the method wrapped inside a RuntimeException. A common forgetful 
> change someone might make is to add
> {code}@Context private HttpSession session; //(instead of private 
> HttpServletRequest){code}
> Which leaves a massive stack trace leaving just an NPE and Spring also tends 
> to obscure the stack-trace of this issue. A better error would be to suggest 
> that the given class ...HttpSession is not a valid Context type. No proxy 
> classes can be created for this type.

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