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  1. JDK
  2. JDK-8187466

NPE while dragging one JavaFx application on multiple display devices

    Details

    • Subcomponent:
    • CPU:
      generic
    • OS:
      windows_10

      Description

      Problem Description:
      NPE is happening while running a JavaFX application on a machine with multiple display devices. Whenever drag application from one display to other it is consistently throwing NPE.

      Steps to reproduce:
      - Set the display devices as shown in the attachments(display1.png and display2.png).
      - Run the attached javafx application - SwingFx.java(or any simple javafx application)
      - Drag the javafx window from one display to other, while dragging keep mouse pointer 1/3 of the title bar on dragging side.

      It is related to bug JDK-8185890(it was intermittent in linux platform), but this bug is consistent in Windows 10.

      Stacktrace:
      Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
                    at sun.swing.JLightweightFrame.updateClientCursor(JLightweightFrame.java:473)
                    at sun.swing.JLightweightFrame.access$000(JLightweightFrame.java:79)
                    at sun.swing.JLightweightFrame$1.updateCursor(JLightweightFrame.java:112)
                    at sun.awt.windows.WLightweightFramePeer.updateCursorImmediately(WLightweightFramePeer.java:92)
                    at java.awt.Component.updateCursorImmediately(Component.java:3148)
                    at java.awt.Container.validate(Container.java:1642)
                    at java.awt.Window.dispatchEventImpl(Window.java:2744)
                    at java.awt.Component.dispatchEvent(Component.java:4711)
                    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
                    at java.awt.EventQueue.access$500(EventQueue.java:97)
                    at java.awt.EventQueue$3$1.run(EventQueue.java:714)
                    at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
                    at java.security.AccessController.doPrivileged(Native Method)
                    at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
                    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
                    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
                    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
                    at java.lang.Thread.run(Thread.java:748)

        Attachments

        1. display1.png
          display1.png
          51 kB
        2. display2.png
          display2.png
          71 kB
        3. SwingFx.java
          1 kB

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              • Assignee:
                bvaidya Balchandra Vaidya
                Reporter:
                akolarkunnu Abdul Kolarkunnu
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                Dates

                • Created:
                  Updated: