RFR (S) 8222491: jcmd can fail converting UTF8 output to strings

[Schmelter, Ralf]

> I feel there must be a better way :) but the fix is fine as-is.

I share your feeling ;)

The best we could come up with was to use the transferTo(Writer) method on the InpuStreamReader.

But the PrintStream is unfortunately no Writer, although it is very close to being one. And wrapping the PrintStream in a OutputStreamWriter fails, since we cannot get the encoding used by the PrintStream (which is probably the default encoding, but I've not seen this specified).