RFR: 8227229: Deprecate the launcher -Xdebug/-debug flags that have not done anything since Java 6 [v3]

[Alan Bateman]

On Tue, 18 Jul 2023 07:58:58 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

>> Can I please get a review of this change which proposes to deprecate for removal the  `-Xdebug` option and `-debug` option of the `java` command? This addresses https://bugs.openjdk.org/browse/JDK-8227229.
>> 
>> As noted in the JBS issue this option is currently a no-op and has been there only for backward compatible since even Java 8 days.
>
> Jaikiran Pai has updated the pull request incrementally with one additional commit since the last revision:
> 
>   include -debug (alias) option in the deprecated log message

src/java.base/share/classes/sun/launcher/resources/launcher.properties line 137:

> 135: \    -Xcheck:jni       perform additional checks for JNI functions\n\
> 136: \    -Xcomp            forces compilation of methods on first invocation\n\
> 137: \    -Xdebug           deprecated and may be removed in a future release.\n\

This drops "does nothing" so no longer clear that the option doesn't do anything. It could be changed to "does nothing; deprecated for removal in a future release". Alternatively maybe it would be better to just remove it from the -X output.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14918#discussion_r1266609817