I wonder if menu's mnemonic parsing is involved. Would it be possible to capture a screenshot of your application when this happens?
-andy From: openjfx-dev <[email protected]> on behalf of Cormac Redmond <[email protected]> Date: Wednesday, October 15, 2025 at 12:52 To: OpenJFX <[email protected]> Subject: MacAccessible substring bug? Hi, I have an application which a user is reporting as unusable. The below happens, repeatedly (sent to me by the user). After calling Dialog.showAndWait, MacAccessible is trying to use String.substring() illegally (JFX 25). java.lang.StringIndexOutOfBoundsException: Range [1, 2) out of bounds for length 1 at java.base/jdk.internal.util.Preconditions$1.apply(Unknown Source) at java.base/jdk.internal.util.Preconditions$1.apply(Unknown Source) at java.base/jdk.internal.util.Preconditions$4.apply(Unknown Source) at java.base/jdk.internal.util.Preconditions$4.apply(Unknown Source) at java.base/jdk.internal.util.Preconditions.outOfBounds(Unknown Source) at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckFromToIndex(Unknown Source) at java.base/jdk.internal.util.Preconditions.checkFromToIndex(Unknown Source) at java.base/java.lang.String.checkBoundsBeginEnd(Unknown Source) at java.base/java.lang.String.substring(Unknown Source) at javafx.graphics@25-internal/com.sun.glass.ui.mac.MacAccessible.accessibilityAttributeValueForParameter(Unknown Source) at javafx.graphics@25-internal/com.sun.glass.ui.mac.MacApplication._enterNestedEventLoopImpl(Native Method) at javafx.graphics@25-internal/com.sun.glass.ui.mac.MacApplication._enterNestedEventLoop(Unknown Source) at javafx.graphics@25-internal/com.sun.glass.ui.Application.enterNestedEventLoop(Unknown Source) at javafx.graphics@25-internal/com.sun.glass.ui.EventLoop.enter(Unknown Source) at javafx.graphics@25-internal/com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(Unknown Source) at javafx.graphics@25-internal/javafx.stage.Stage.showAndWait(Unknown Source) at javafx.controls@25-internal/javafx.scene.control.HeavyweightDialog.showAndWait(Unknown Source) at javafx.controls@25-internal/javafx.scene.control.Dialog.showAndWait(Unknown Source) <...SNIPPED...> It seems a lot like this (unfixed) issue here: https://bugs.openjdk.org/browse/JDK-8235989, except the fallout isn't trivial in my application's case (though, I'm not sure how the error manifests itself to the user). I cannot reproduce the issue myself. Is this a bug and can/should this be fixed? Kind Regards, Cormac
