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