RFR(9): 8176533: REGRESSION: a java process is not recognized by jcmd/jinfo/jstack/jmap tool

[Robbin Ehn]

Thanks for looking at this so quickly Dmitry!

/Robbin

On 03/15/2017 07:14 PM, Dmitry Samersoff wrote:
> Robbin,
>
> Looks good to me.
>
> -Dmitry
>
> On 2017-03-15 20:41, Robbin Ehn wrote:
>> Hi all, please review:
>>
>> When starting the VM with agentlib and suspended, jcmd/jinfo/jstack/jmap
>> don't work until a debugger have attach.
>>
>> There is an underlying issue with AttachProvider that don't list that VM
>> even if it's attachable.
>> That issue is present in JDK 8 (“jcmd -l” don’t list this process).
>>
>> This fix only fixes the regression by not validating the pid against
>> available VirtualMachineDescriptors.
>> One problem with not validating is that we will send SIGQUIT to that pid
>> even if it’s not a java process, but it’s the same behavior as JDK 8.
>>
>> The regression was introduced by
>> https://bugs.openjdk.java.net/browse/JDK-8156537
>>
>> VirtualMachineDescriptor was not easily create-able from just a string
>> pid, you need an AttachProvider.
>> I instead change so we use a collection of pids where applicable.
>>
>> Webrev: http://cr.openjdk.java.net/~rehn/8176533/webrev/
>> Issue: https://bugs.openjdk.java.net/browse/JDK-8176533
>>
>> Passes jdk/test/sun/tools/ and internal test group.
>> Manual tested the regression case.
>>
>> A new issue for the AttachProvider will be filed.
>>
>> Thanks
>>
>> /Robbin
>
>