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    • Resolved In Build:
      b23

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        Description


        Full JDK Versions
        -----------------
        Reproducible since 7u4 (first Mac release)

        System Configuration
        --------------------
        Mac OS

        Problem Description
        -------------------
        Under certain circumstances, some key press events seem to be lost on
        Mac OS with Java 8.

        The testcase provided contains a JFrame with a with a KeyListener attached.
        The listener prints a line describing keyPressed, keyReleased and keyTyped
        events. If the user presses and holds a key, you will see a KEY_PRESSED
        event, followed by a KEY_TYPED event, and then nothing*. Once the key is
        released, a KEY_RELEASED event is seen, as expected, but from that point
        onwards any further key presses only generate KEY_RELEASED events. The
        expected KEY_PRESSED and KEY_TYPED events do not appear.

        The problem only seems to occur with keys which correspond to letters which
        have alternative accented forms. For example, the problem occurs with 'a',
        'e', and 'i', but not with 'f'.

        This issue is reproducible on all Mac releases, from 7u4 (the first Mac
        release) onwards.

        * This may also be a bug. The behavior differs from other platforms such as
        Windows, where rapidly repeating KEY_PRESSED and KEY_TYPED events are seen
        when keys are held down.

        Testcase
        --------
        import java.awt.event.KeyEvent;
        import java.awt.event.KeyListener;
        import javax.swing.JFrame;
        import java.util.Date;

        public class TestProject {
        public static void main(String[] args) {
        JFrame mainFrame = new JFrame("TestProject");
        mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        mainFrame.addKeyListener(new KeyListener() {
        public void keyPressed(KeyEvent event) {
        System.out.println(new Date() + " Key Pressed: " + event);
        }
        public void keyReleased(KeyEvent event) {
        System.out.println(new Date() + " Key Released: " + event);
        }
        public void keyTyped(KeyEvent event) {
        System.out.println(new Date() + " Key Typed: " + event);
        }
        });
        mainFrame.pack();
        mainFrame.setSize(640, 480);
        mainFrame.setVisible(true);
        while(true) {
        try {
        Thread.sleep(1000);
        } catch (InterruptedException e) {}
        }
        }
        }

        Reproduction Instructions
        -------------------------
        1. Compile and run the testcase provided
        2. Press and release the 'i' key once, quickly, which correctly shows the
        KEY_PRESSED, KEY_TYPED and KEY_RELEASED events being printed, as expected.
        3. Press and hold the 'i' key for 3 seconds, and release.
        4. Press and release the 'i' key repeatedly. Each time, note that only the
        KEY_RELEASED event is seen. The KEY_PRESSED and KEY_TYPED events are missing.

        Observed output for steps 3 and 4:

        Thu Feb 23 15:50:54 IST 2017 Key Pressed:
        java.awt.event.KeyEvent[KEY_PRESSED,keyCode=73,keyText=I,keyChar='i',keyLocati
        on=KEY_LOCATION_STANDARD,rawCode=0,primaryLevelUnicode=0,scancode=0,extendedKe
        yCode=0x49] on frame0
        Thu Feb 23 15:50:54 IST 2017 Key Typed:
        java.awt.event.KeyEvent[KEY_TYPED,keyCode=0,keyText=Unknown keyCode:
        0x0,keyChar='i',keyLocation=KEY_LOCATION_UNKNOWN,rawCode=0,primaryLevelUnicode
        =0,scancode=0,extendedKeyCode=0x49] on frame0
        Thu Feb 23 15:50:57 IST 2017 Key Released:
        java.awt.event.KeyEvent[KEY_RELEASED,keyCode=73,keyText=I,keyChar='i',keyLocat
        ion=KEY_LOCATION_STANDARD,rawCode=0,primaryLevelUnicode=0,scancode=0,extendedK
        eyCode=0x49] on frame0
        Thu Feb 23 15:51:03 IST 2017 Key Released:
        java.awt.event.KeyEvent[KEY_RELEASED,keyCode=73,keyText=I,keyChar='i',keyLocat
        ion=KEY_LOCATION_STANDARD,rawCode=0,primaryLevelUnicode=0,scancode=0,extendedK
        eyCode=0x49] on frame0
        Thu Feb 23 15:51:05 IST 2017 Key Released:
        java.awt.event.KeyEvent[KEY_RELEASED,keyCode=73,keyText=I,keyChar='i',keyLocat
        ion=KEY_LOCATION_STANDARD,rawCode=0,primaryLevelUnicode=0,scancode=0,extendedK
        eyCode=0x49] on frame0

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                • Assignee:
                  dmarkov Dmitry Markov
                  Reporter:
                  shadowbug Shadow Bug
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                  • Created:
                    Updated:
                    Resolved: