RFR(S): 8228960: [TESTBUG] containers/docker/TestJcmdWithSideCar.java: jcmd reports main class as 'Unknown'

Bob Vandette bob.vandette at oracle.com
Wed Aug 7 18:38:31 UTC 2019

Can’t you come up with a better way of synchronizing the test by possibly writing a 
file and waiting for it to exist with a timeout?  Isn’t there a shared volume between the two

We’ve been fighting test reliability for a while now.  I can only hope we’re getting 
to the end.


> On Aug 7, 2019, at 2:18 PM, Severin Gehwolf <sgehwolf at redhat.com> wrote:
> Hi Misha,
> On Tue, 2019-08-06 at 20:17 -0700, mikhailo.seledtsov at oracle.com wrote:
>> Please review this change that fixes a container test TestJcmdWithSideCar.
>> My investigation indicated that a root cause for this failure is:
>> JCMD -l shows 'Unknown' for class name because the main class has not 
>> been loaded yet.
>> The target test JVM has started, it is initializing, but has not loaded 
>> the main test class.
> That's what I've found too.
>> The proposed solution is to try 'jcmd -l' several times, with a short 
>> sleep in between.
> Thread.sleep() isn't great, but I'm not sure there is an alternative.
>> Also I have commented out the testCase02() due to another bug:
>> "JDK-8228850: jhsdb jinfo fails with ClassCastException: 
>> s.j.h.oops.TypeArray cannot be cast to s.j.h.oops.Instance",
>> which is not a test bug. IMO, it is better to run the test and skip a 
>> sub-case than to skip the entire test.
>>     JBS: https://bugs.openjdk.java.net/browse/JDK-8228960
>>     Webrev: http://cr.openjdk.java.net/~mseledtsov/8228960.00/
> Looks OK to me.
> Thanks,
> Severin

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