Question about deadlock issue

Steven Yi stevenyi at
Thu Sep 17 14:06:34 UTC 2020

Hi Kevin,

Thanks for the quick response, very much appreciated.  I installed and
tested again with AdoptOpenJDK 15.  In my app I found the popup from
the text field did not trigger the deadlock now, but my context menu
did. It seemed to take longer before the deadlock occurred though. It
used to happen almost immediately after switching apps and returning.

With the simple test case I submitted, it is also taking longer to
trigger. I can hit the "Show Context Menu" a few times, switch apps
and come back, hit the button a few times, and if I repeat the process
it would inevitably deadlock again and I had to force quit the app.

I recorded a quick screencast to show the issue:

Netbeans shows that adoptopenjdk-15 was used for JAVA_HOME.

I use JNI a bit and program in C a fair amount, but I haven't had much
bandwidth to sit down to learn JavaFX and Swing's native
implementation on macOS to debug unfortunately. I was hoping the
information about the hang in
sun.lwawt.macosx.LWCToolkit.doAWTRunLoopImpl might spark an idea for
someone here.


On Thu, Sep 17, 2020 at 8:56 AM Kevin Rushforth
<kevin.rushforth at> wrote:
> Update: I cannot reproduce this even using your updated instructions.
> How often does it reproduce for you? Have you tried with a more recent
> JDK (in case it is a JDK bug)? I recommend trying it with the
> just-released JDK 15 [1].
> -- Kevin
> [1]
> On 9/17/2020 5:26 AM, Kevin Rushforth wrote:
> > If you have additional information that is relevant to reproducing the
> > bug or helpful in identifying a possible fix, you can send it to this
> > alias and either I or another OpenJFX Author, Committer, or Reviewer
> > can add it to the bug report. I have updated the bug report with your
> > note about where you found the situation reproducible.
> >
> > Since the bug is easily reproducible with no known workaround, I set
> > the target fix version to JavaFX 16, but there are no guarantees. If
> > you or another developer want to take a stab at contributing a fix,
> > that would make it more likely to be fixed sooner.
> >
> > -- Kevin
> >
> >
> > On 9/17/2020 4:01 AM, Steven Yi wrote:
> >> Hi All,
> >>
> >> I had reported a deadlock issue that requires app restart whenever a
> >> context menu is shown in JFX embedded within Swing (i.e., JFXPanel) on
> >> macOS:
> >>
> >>
> >>
> >> I had not seen any updates on the issue in a month and I'm wondering
> >> what to do. This is a serious bug for me and I'd like to have as
> >> informed an opinion at this point on my decision on whether to
> >> continue using JavaFX. Any advice here would be appreciated.
> >>
> >> A few things:
> >>
> >> * I wanted to add information to the ticket but I'm a 3rd party bug
> >> reporter and I do not see how one can do this. I found that this
> >> situation is reproducible if I use "built-in" context menus, such as
> >> right clicking a text field. I thought I might be able to replace my
> >> own JFX code to use Swing popups and windows where necessary, but
> >> going and patching the built-in controls felt like too much.
> >>
> >> * I tested using the recently released JavaFX 15 and found the
> >> deadlock to still be reproducible. (Using AdoptOpenJDK 11.0.8+10)
> >>
> >> * I don't really understand the JBS in regards to priority (i.e, what
> >> P3 means).  I understand that using JavaFX within a Swing application
> >> may not be a priority for anyone else but myself. However, I am trying
> >> to understand if this is being looked at and if there's any way for me
> >> to figure out a timeline so I can make a decision whether to remove
> >> JavaFX from my application or not. There is a lot of code in my
> >> application that I'd have to port back to Swing, but realizing that
> >> any macOS user of my app is pretty much going to run into this at some
> >> point, I have to seriously consider this option.
> >>
> >> Thanks,
> >> Steven
> >

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