RFR: 8332303: Better JMX interoperability with older JDKs, after removing Subject Delegation [v6]

[Kevin Walls]

On Fri, 24 May 2024 18:22:18 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

>> Running JConsole from a previous JDK, and attaching to jdk-23 (after [JDK-8326666](https://bugs.openjdk.org/browse/JDK-8326666): Remove the Java Management Extension (JMX) Subject Delegation feature), the MBean tab is blank.
>> 
>> In javax/management/remote/rmi/RMIConnectionImpl.java:
>> addNotificationListener rejects a non-null delegationSubjects array, but older JDKs will send such an array. It could accept the array, and only reject/throw if it contains a non-null Subject (i.e. if an attempt to use subject delegation is really happening).
>> 
>> Manually testing JConsole, the MBean tab is fully populated and usable.
>
> Kevin Walls has updated the pull request incrementally with one additional commit since the last revision:
> 
>   entries consistency in param and throws text

Thanks Chris, and Daniel, for the reviews!

-------------

PR Comment: https://git.openjdk.org/jdk/pull/19253#issuecomment-2130210171