Canceling an asynchronous IO operation throws NPE

[Alan Bateman]

Umashankar wrote:
> :
> Alan,
> In my case I am specifying a CompletionHandler to the write() 
> operation that I cancel immediately after initiating it.
It turns out there is a second problem here - thanks for keeping me 
honest! On Solaris/Linux (Windows is okay) attempting to cancel any of 
AsynchronousFileChannel operations causes this NPE with the result that 
the cancelled method is not invoked. I'll get this fix in for the next 
build.

-Alan.