RFR: 8332303: Better JMX interoperability with older JDKs, after removing Subject Delegation

[Chris Plummer]

On Wed, 15 May 2024 21:38:54 GMT, Kevin Walls <kevinw at 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?

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PR Comment: https://git.openjdk.org/jdk/pull/19253#issuecomment-2113656022