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

[Jaikiran Pai]

On 17/11/22 1:36 pm, Alan Bateman wrote:
> On Thu, 17 Nov 2022 07:41:09 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:
>
>> I think if we want to improve this error message then maybe attempt the solution proposed by Alan in the JBS issue:
>>
>>> Extend jdk.includeInExceptions to include "file", meaning opt-in in secure deployments to include the tmp directory in the exception.
> Yeah, I listed three suggestions in the JBS issue. This PR is item 2, which is to emit a warning a startup when the running with -Djava.io.tmpdir set to a bad directory. That is useful on its own and should help in some scenarios.

Thank you Alan for that detail. I didn't realize this was an independent 
change being pursued.

-Jaikiran