JavaFX Application Thread is recursively re-entrant into Eventhandler handle() method under some circumstances
kevin.rushforth at oracle.com
Sat Sep 8 12:02:42 UTC 2018
I am not aware of such a bug. If you have a test program, then you can
file a bug here:
On 9/7/2018 5:37 PM, javafx at use.startmail.com wrote:
> I have a couple of very small apps (3 small classes in one case and 5
> in another) which demonstrate that, under some circumstances, the
> JavaFX Application Thread will recursively re-enter
> So this means that it is already in handle (and calls therefrom) and
> will, in some situations not complete that processing (thus exiting
> handle) before it reappears in the same instance of EventHandler's
> handle method again. So this is true recursion.
> I actually don't know if this is expected behavior or not. No one I've
> talked to expected it; the general understanding is the JavaFX
> Application Thread (processing) is specifically single-threaded and
> also that it will defintily complete one invocation of handle() before
> beginning another one.
> I have to say that there is NO other Thread in play here, at least no
> other Thread my applications create (what's going on QuantumToolKit
> may be a different story.)
> The material upshot of this is it can lead to apparent program
> incorrectness if the dev believes that it's not the case, and 100% of
> devs I've talked to think it's not possible.
> I am happy to post or attach the classes or modules as requested but
> first I wanted to check to see if in fact this is already known to be
> true and is in fact expected behavior, in which case it's a non-issue
> and just a subtlety people are not aware of.
> Thank you so much !
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