堆栈跟踪未使用的异常

Question

i have this wierd exception wheere it's stack trace .

I'v searched about it and the usefull resault with someone who did have the same glitch when using a modal JDialog instances and disposing it with KeyListner while the frame owner alwaysOnTop proprety is set to false .

But in my case i havn't use any dialogs at all!! here is the exception stack trace :

Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
at java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:2062)
at java.awt.Component.getLocationOnScreen(Component.java:2036)
at javax.swing.text.JTextComponent$InputMethodRequestsHandler.getTextLocation(JTextComponent.java:4643)
at sun.awt.im.InputMethodContext.getTextLocation(InputMethodContext.java:278)
at sun.awt.windows.WInputMethod$1.run(WInputMethod.java:588)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

I haven't used this app for a while and i can confirm that no one did mess with the code ,earlier i was devoloping the app in a linux enviroment it didn't throw that exception , but after changing my laptop and the enviroment to windows somehow this is happenning . I need to deliver my app soon and this exception have a strange thing that it's not thrown every time i open my app ! and i couldn't face any pattern to notice when it wil be thrown or what specific action that would do that . what am asing is if any one did face off a strange case like this what is it usually from ?? and thanks in advance .

Found the solution !I just found it at bugzilla it seems to be some sort of bug when is extending JRootPane without implemeting RootPaneContainer in windows in Runtime: Java(TM) SE Runtime Environment 1.8.0_141-b15 with some gpu and methods related stuff i couldn't understand and if also used modal JDialogs without the owner always on top when using the default rootpane button of the dialogs to exit .

Answer 1

I used to get regular Swing Exception s without a traceable stack trace. It was because I was violating the rules regarding concurrency in Swing. This SO answer elaborates: SwingWorker ProgressBar . Basically, make sure all of your Swing code is being called on the Event Dispatch Thread.