On Thu, 16 May 2024 08:25:17 GMT, Kevin Walls <kev...@openjdk.org> wrote:

>>> > ...Is there any way to run jconsole in a way that would result in it 
>>> > passing a non-empty delegationSubjects, resulting in this issue still 
>>> > reproducing?
>>> 
>>> I don't think there is, JConsole has a hard null in this call. Also I don't 
>>> see in JConsole any calls of getMBeanServerConnection with a Subject being 
>>> passed, that's the main gateway method to use the removed feature.
>>> 
>>> If there was a way to use Subject Delegation with JConsole (or with 
>>> anything else), and you try to attach to a jdk-23, then that will fail with 
>>> the UnsupportedOperationException and that's what we want as the feature is 
>>> gone. Realistically it's a feature with no known usage as discussed in the 
>>> deprecation and removal changes.
>> 
>> If jconsole is passing null, why is it triggering this exception?
>
>> If jconsole is passing null, why is it triggering this exception?
> 
> JConsole passes null, but when running on an older jdk, the older 
> RMIConnector actually "promotes" it to an array before making the remote 
> call.  If you connect to a jdk-23 with the removal, the exception is thrown.
> 
> (JConsole running on jdk-23 can connect to jdk-23 fine.)
> (Also just to note, a jdk-23 JConsole can connect to an older JDK and show 
> the MBean tab OK.)

@kevinjwalls I assume the RN for the removal of the subject delegation feature 
will need to be adjusted once this current PR is integrated.

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PR Comment: https://git.openjdk.org/jdk/pull/19253#issuecomment-2119907523

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