Canceling an asynchronous IO operation throws NPE
Umashankar.Ningaiah at Sun.COM
Mon Jul 28 08:19:08 PDT 2008
Alan Bateman wrote:
> Umashankar wrote:
>> Hi Alan,
>> On canceling an IO operation that is in progress,I get a
>> CancellationException which is expected as per the spec.
>> But in the stack trace, I also see a NullPointerException.
>> Following is the stack trace.
>> at sun.nio.ch.PendingFuture.get(PendingFuture.java:136)
>> at AsyncIOCancelTests.main(AsyncIOCancelTests.java:19)
>> Exception in thread "Thread-1" java.lang.NullPointerException
>> at sun.nio.ch.PendingFuture$1.run(PendingFuture.java:206)
>> at java.lang.Thread.run(Thread.java:674)
>> Please let me know if this is correct.
> There's a bug here - thanks! It arises when you cancel an I/O
> operation that doesn't have a CompletionHandler but the code is trying
> to invoke its cancelled method. It should be harmless (meaning an
> annoyance printed to the console) and I'll fix it for the next build.
In my case I am specifying a CompletionHandler to the write() operation
that I cancel immediately after initiating it.
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