Virtual threads in existing FJP logic

Ron Pressler ron.pressler at
Mon Feb 17 14:33:16 UTC 2020

Hi Christian.

I’m not sure I understand. You want to use virtual threads as
FJP *workers*? If so, why? 

It is never a good idea to pool virtual threads, and FJP is all about 
pooling. Of course, you could always set your FJP as the *scheduler*
for your virtual threads.


On 14 February 2020 at 20:26:20, Christian Stein (sormuras at at wrote:

> Hi everybody,
> Marc and I from the JUnit team are exploring ways how to
> integrate virtual threads into the Jupiter test engine. Today
> we're using a FJP to enable parallel test execution.
> Find the implementation here [0], where at end of the source
> file, you'll see our custom ForkJoinWorkerThreadFactory and
> the custom ForkJoinWorkerThread implementation.
> My idea was to "simply" configure those custom classes to
> create virtual threads. Is this possible? If not, we might
> resort to add a virtual thread based implementation of the
> HierarchicalTestExecutorService interface.
> Cheers,
> Christian
> [0]:

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