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ThreadStart/ThreadEnd events

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

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JDI ThreadStartRequest/ThreadDeathRequest define a new method to control whether thread start/end events are sent for all threads or only platform threads.

IsVirtual

JDI ThreadReference defines isVirtual to test if a thread is a virtual thread.

JDWP ThreadReference/IsVirtual is the equivalent.

Not Supported

The following are not currently supported for virtual threads:

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