8205132: Remove Thread.countStackFrames()

David Holmes david.holmes at oracle.com
Wed Oct 30 04:38:51 UTC 2019

On 30/10/2019 2:26 am, Alan Bateman wrote:
> On 23/10/2019 08:25, Alan Bateman wrote:
>> Thread::countStackFrames has been deprecated for 20+ years and has 
>> been marked for-removal since Java SE 9. I'd like to remove it for 
>> Java SE 14. It's was never a well-defined method and I've been unable 
>> to find anything that uses it. The StackWalker API is a much better 
>> solution for code that is interested in the number of stack frames.
> Joe Darcy has suggested degrading the method in advance of its removal. 
> We did the same with stop(Throwable) when we changed it to throw UOE in 
> Java SE 8 before finally removing it in 11. Here is the updated webrev 
> and CSR. The CSR will need to be re-reviewed. The method description is 
> brief and the same as what we did for stop(Throwable).
> http://cr.openjdk.java.net/~alanb/8205132/webrev.02/

Looks good.

> https://bugs.openjdk.java.net/browse/JDK-8232654


> Also just to summarize the discussion/objection from Seth Lytle. I think 
> we've established that that it was a regression in JDK 10 that allowed 
> that example to work. The method has always been specified to fail when 
> the thread is not suspended.



> -Alan

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