RFR: 8290313: Produce warning when user specified java.io.tmpdir directory doesn't exist

[Alan Bateman]

On Tue, 15 Nov 2022 19:02:30 GMT, Weibing Xiao <duke at openjdk.org> wrote:

> print warning message for java.io.tmpdir when it is set through the command line and the value is not good for creating file folder.

src/java.base/share/classes/java/lang/System.java line 2247:

> 2245:         Unsafe.getUnsafe().ensureClassInitialized(StringConcatFactory.class);
> 2246: 
> 2247:         // print out warning message if java.io.tmpdir is set through command line with non-existing folder

It's probably okay to have the warning emitted in checkIoTmpDir, just a bit out of sight and inconsistent with the other warnings printed in this class.

I think the comment could be improved by bit with "Emit a warning if java.io.tmpdir is set via the command line to a directory that doesn't exist".

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PR: https://git.openjdk.org/jdk/pull/11174