Please review: 7146552 LoggingMXBeanTest intermittent failure

Mandy Chung mandy.chung at
Sat Oct 13 06:13:54 UTC 2012

On 10/12/2012 8:54 PM, Jim Gish wrote:
> I was able to reproduce the failure rather easily although for some runs it took many thousands of iterations.  I reviewed all the logging tests in test/java/util/logging and it appears that only the two that I fixed have the problem.

Thanks for reviewing all the logging tests and making them reliable.


> Jim
> ----- Original Message -----
> From: mandy.chung at
> To: jim.gish at
> Cc: core-libs-dev at
> Sent: Friday, October 12, 2012 6:59:45 PM GMT -05:00 US/Canada Eastern
> Subject: Re: Please review: 7146552 LoggingMXBeanTest intermittent failure
> On 10/12/2012 9:55 AM, Jim Gish wrote:
>> Please review
>> The LoggingMXBeanTest has been intermittently failing because garbage
>> collection can cause the (weak) references to Logger instances to go
>> away.  LoggingMXBeanTest2 has the same issue, but no bug has (yet)
>> been filed against it.
>> The fix is to simply make the Logger variables static so they don't
>> get gc'd.
> Looks okay to me.   Like Alan said, you can use the same bug for both
> tests as it's the same issue.
> I checked the nightly failure statistics and these 2 tests have been
> passing for some time.  Were you able to reproduce the intermittent
> failure (it may require to modify the test and force GC) and verify the
> fix?
> I am not up to whether all logging tests have been audit if they may run
> into the same issue per the suggestion [2] ([1] was the thread reviewing
> a similar test bug fix).   It'd be good to look at all logging tests if
> you have the cycle.
> Thanks
> Mandy
> [1]
> [2]

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