On Fri, 21 Mar 2025 20:56:01 GMT, Martin Fox <m...@openjdk.org> wrote:
> There is an undocumented limit on nesting calls to CFRunLoopRun (or the > equivalent wrapper NSRunLoop methods). When the limit is hit the OS > terminates the Java app. The situation arises when a JavaFX app creates too > many nested event loops from within Platform.runLater runnables. > > This PR doesn't change the limit (which is 250+ nested loops) but it does > throw an exception just before the limit is reached so a JavaFX developer > will get a useful Java stack trace instead of an OS crash log. > > On the Mac the nested event loop has two stages: first we ask the run loop to > run, then we pull an event out and process it. A Platform.runLater runnable > is executed in the first stage so if the runnable starts a new nested event > loop the system will re-enter CFRunLoopRun. The same isn't true if an input > event handler starts a new nested event loop; at that point we're in stage > two and are past the call to CFRunLoopRun. This pull request has now been integrated. Changeset: c452189e Author: Martin Fox <m...@openjdk.org> URL: https://git.openjdk.org/jfx/commit/c452189e54124a941201bfa4d68830f7a6d65333 Stats: 78 lines in 5 files changed: 76 ins; 0 del; 2 mod 8351733: Crash when creating too many nested event loops Reviewed-by: kcr, angorya ------------- PR: https://git.openjdk.org/jfx/pull/1741
