jmx-dev RFR: 8368527: JMX: Add an MXBeans method to query GC CPU time [v2]

[Jonas Norlinder]

On Wed, 15 Oct 2025 10:14:21 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

>> Jonas Norlinder has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Move from j.l.management to com.sun.management etc.
>
> Or:
> 
> 
>      * @implNote Time calculation is implementation-specific, and may include details
> 	 * such as CPU time for driver threads, workers, VM Operations and string deduplication. 
> 	 * The return value can be -1 if called when measurement is not possible, such as during shutdown.

Thanks for the suggested API docs @kevinjwalls! I pushed a proposal to use j.l.management, with the proposed generic API docs.

I dropped "may" and "any" from the paragraph about `-1` return value from @kevinjwalls original suggestion:

     * This method return {@code -1} if the platform does
     * not support this operation or the information is not
     * available.

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PR Comment: https://git.openjdk.org/jdk/pull/27537#issuecomment-3423134361