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Virtual threads are just objects in the heap, there may be millions of them. There is no API support for enumerating all virtual threads.

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JDI VirtualThreads.allThreads() (and JDWP VirtualMachine/AllThreads) enumerates all active platform threads, as before.

Thread groups

Virtual threads are not active members of a thread group.

JDI JDI ThreadGroupReference::threads (and JDWP ThreadGroupReference/Children) enumerate all active platform threads in the group, as before.

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Option Name and Value	Description	Default
enumeratevthreads=y\|n	thread lists include vthreads	n
trackvthreads=some\|all	track some or all vthreads	some	enumeratevthreads=y\|n	thread lists include vthreads	y
fakevthreadstartevent=y\|n	send fake start event when needed	y

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