JDK-8027351: (ref) Base's class finalize method not invoked if a private finalize method exists in its subclass

David Holmes david.holmes at oracle.com
Tue Nov 5 02:29:32 UTC 2013

On 5/11/2013 12:21 PM, Mandy Chung wrote:
> On 11/4/2013 6:03 PM, David Holmes wrote:
>> Hi Mandy,
>> This all seems quite reasonable to me.
>> Two minor nits:
>> 1. The "delay ntil" typo in Finalizer.java is still present.
> Missed that :(
>> 2. In VM.java. booted need not be volatile now that it is only
>> accessed within a locked region.

Oops my bad! The accessor wasn't synchronized but now is. Your call 
whether to leave as is or revert to previous.

Sorry - and thanks.


Also awaitBooted might as well be
>> void as it can only ever return true.
> Fixed.  Revised webrev at:
> http://cr.openjdk.java.net/~mchung/jdk8/webrevs/8027351/webrev.03/
> Thanks for the review.
> Mandy
>> Thanks,
>> David
>> On 5/11/2013 6:04 AM, Mandy Chung wrote:
>>> Thank you all for the suggestions.
>>> Before the VM initialization is completed, any agent ought to be careful
>>> in what things it can do and what shouldn't do.  I think it's reasonable
>>> to ignore System.runFinalization if it's called at early startup phase.
>>> I'm unclear if there is any use case that we really require finalization
>>> to happen before VM is booted (I can imagine other problems may happen).
>>> I change the runFinalization and runAllFinalizers methods to return if
>>> it's not booted and also change runFinalizer method to take
>>> JavaLangAccess to simplify the synchronization instead of caching it in
>>> the static field.
>>> http://cr.openjdk.java.net/~mchung/jdk8/webrevs/8027351/webrev.02/
>>> David - I decided to leave VM.awaitBooted as it is.  Having the callsite
>>> to call awaitBooted makes it explicit and clear that it's blocking and
>>> we will keep SharedSecrets.getJavaLangAccess method consistent with the
>>> other SharedSecrets methods that they are all getter methods. If any
>>> future change calls SharedSecrets.getJavaLangAccess before it's booted,
>>> it's a little easier to diagnose (NPE vs hangs).
>>> Peter - thanks for the ObjectAccess idea.  I don't think supporting
>>> finalization to happen before VM is booted buys us anything and I would
>>> rather keep this change simple.
>>> Mandy

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