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

Tue Nov 15 21:52:04 UTC 2022

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.

I just wonder if this change warrants a CSR. If it is merely printing out a warning, it may not require it IMO. Otherwise, if some real behavioral change exists, or clarifying the behavior, I think the `java.io.tmpdir` in javadoc should mention it.

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