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JDI VirtualThreads.allThreads() (and JDWP VirtualMachine/AllThreads) enumerates all active platform threads, as beforevirtual threads are not enumerated.

Thread groups

Virtual threads are not active members of a thread group. 

JDI ThreadGroupReference::threads (and JDWP ThreadGroupReference/Children) enumerate all active platform threads in the a group, as beforevirtual threads are not enumerated.

ThreadStart/ThreadEnd events

JDI ThreadStartEvent/ThreadDeathEvents are sent for all threads , as before, but it when enable. This may impact performance if there are a huge number of virtual threads.

JDWP EventRequest/Set defines a new PlatformThreadsOnly filter that can be used when requesting THREAD_START and THREAD_END events. This allows these events to be filtered for virtual threads so they are not sent to the front-end/debugger.

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