RFR: 8281658: Add a security category to the java -XshowSettings option [v8]

[Mandy Chung]

On Thu, 29 Jun 2023 08:27:43 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> The changes make me wonder if `-XshowSetting:aardvark` should be an error rather than default to print all settings. Something we should look at again. Same thing for `-XshowSettings:system` on non-Linux, probably should have been a bit more discussion when that was added as its more about the container environment.

I think throwing an error for an invalid suboption makes sense.   `-XshowSetting` without the suboption is default to print all settings, i.e. equivalent to `-XshowSetting:all`.   But the switch statment is missing the `all` case.   I think we should fix this and error for any invalid option.

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PR Comment: https://git.openjdk.org/jdk/pull/14394#issuecomment-1624030798