RFR:8219721: jcmd from earlier release will hang attaching to VM with JDK-8215622 applied

[David Holmes]

Hi Lin,

On 4/03/2019 7:13 pm, 臧琳 wrote:
> Dear All,
>     May I ask your help to review the fix of compatibility issue introduced by JDK-8215622
>     webrev:  http://cr.openjdk.java.net/~xiaofeya/8219721/webrev.01/
>     Bug:  https://bugs.openjdk.java.net/browse/JDK-8219721
> 
>     FYI, this webrev is forked from the discussion https://mail.openjdk.java.net/pipermail/serviceability-dev/2019-February/027240.html.

This looks good to me. I can confirm that it fixes the problem of tools 
from earlier releases hanging.

Thanks,
David

> Thanks,
> Lin
>