RFR: 8255934: JConsole 14 and greater fails to connect to older JVM

[Serguei Spitsyn]

On Mon, 16 Nov 2020 23:00:05 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

> OperatingSystemMXBean was changed in jdk14 (see JDK-8226575):
> New methods getTotalMemorySize and getFreeMemorySize were added, old getTotalPhysicalMemorySize and getFreePhysicalMemorySize were deprecated.
> 
> The fix adds fallbacks for the values (i.e. if new methods fail, jconsole calls old methods)

Hi Alex,
It looks good to me.
Thanks,
Serguei

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Marked as reviewed by sspitsyn (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1243