Protocol version of Attach API

[Thomas Stüfe]

Hi David, Yasumasa,


>
> > Do we support connection to later VMs from earlier JDK tools?
>
> I could not find the spec about this.
> So I asked to serviceability folks before filing this to JBS :-)
>
>
Just to chime in on that, I do not know if it is specified but it is
certainly very handy in daily use. I often use old jcmd tools to connect to
newer VMs. I always thought that was a neat design.

..Thomas
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