This appears to be a deadlock. I've been able to replicate it, but it's annoyingly finicky to get it to freeze. A thread gets stuck on WaitForSingleObject at awt_Toolkit.cpp#L3139 (in AwtToolkit::InvokeInputMethodFunction) waiting for an object to be signaled, but the signalling gets lost. And so it waits indefinitely.
dmarkov, do you know more? A possible solution would be to change the timeout to be 1000ms, but that may have unintended effects. SWinxy On Mon, Aug 5, 2024 at 5:23 AM Reto Merz <reto.m...@abacus.ch> wrote: > Hello, > > Our customers are using Drag & Drop functionality more and more > and reports are increasing that our application is haning. > It starts to escalate since the only workaround is to restart the app > right now. > > The problem is already reported with JDK-8305479 [1] > > Is there any way to increase the priority of that issue > or is a developer here we can hire to search for a fix (and create a pull > request)? > > Btw, the bug is much easier to reproduce: > > 1) Start the demo app (see [1]) > 2) try to drop a document (eg: pdf file) from the windows desktop into the > textfield > > Repeat step 2 if necessary. For me after 1-2 try this will cause the hang. > If not, move the JFrame to another position and repeat step 2 again. > > Tested with latest JDK: > java version "22.0.2" 2024-07-16 > Java(TM) SE Runtime Environment (build 22.0.2+9-70) > Java HotSpot(TM) 64-Bit Server VM (build 22.0.2+9-70, mixed mode, > sharing) > > OS MS Windows: > Microsoft Windows [Version 10.0.17763.5458] > > Regards > Reto Merz > > [1] https://bugs.openjdk.org/browse/JDK-8305479 > >
