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  1. JDK
  2. JDK-8233746

Eclipse embedded application with JavaFX - issue only on Linux

    Details

    • Type: Bug
    • Status: Open
    • Priority: P3
    • Resolution: Unresolved
    • Affects Version/s: 8, openjfx11, openjfx13
    • Fix Version/s: tbd
    • Component/s: javafx
    • Subcomponent:
    • CPU:
      x86
    • OS:
      linux

      Description

      ADDITIONAL SYSTEM INFORMATION :
      LINUX_X86_64
      Java 8 or 11 or 13
      JavaFX: 11.0.3 or 13.0.x

      A DESCRIPTION OF THE PROBLEM :
      Dear JavaFX support team,

      The exception happens only on Linux, JavaFX 8, 11+ (Java 11 or 13 not relevant). Important in standalone scenario - without embedding inside Eclipse works fine.

      Somehow JavaFX thread check fails inside "SWT" environment.

      Stacktraces:
      java.lang.IllegalStateException: Not on FX application thread; currentThread = main
      at javafx.graphics/com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:291)
      at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:424)
      at javafx.web/javafx.scene.web.WebEngine.checkThread(WebEngine.java:1207)
      at javafx.web/javafx.scene.web.WebEngine.<init>(WebEngine.java:839)
      at javafx.web/javafx.scene.web.WebEngine.<init>(WebEngine.java:826)
      at javafx.web/javafx.scene.web.WebView.<init>(WebView.java:260)
      at com.sap.components.controls.html.utils.Browser$1.call(Browser.java:87)
      at com.sap.components.controls.html.utils.Browser$1.call(Browser.java:83)
      at com.sap.components.controls.html.utils.Helpers$1.run(Helpers.java:36)
      at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
      at java.base/java.security.AccessController.doPrivileged(Native Method)
      at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
      at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
      at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)
      at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:1600)
      at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4349)

      ...

      Exception in thread "JavaFX Application Thread" org.eclipse.swt.SWTException: Invalid thread access
      at org.eclipse.swt.SWT.error(SWT.java:4711)
      at org.eclipse.swt.SWT.error(SWT.java:4626)
      at org.eclipse.swt.SWT.error(SWT.java:4597)
      at org.eclipse.swt.widgets.Widget.error(Widget.java:532)
      at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:470)
      at org.eclipse.swt.widgets.Control.isVisible(Control.java:4462)
      at org.eclipse.swt.widgets.ProgressBar.timerProc(ProgressBar.java:307)
      at org.eclipse.swt.widgets.Display.windowTimerProc(Display.java:5811)
      at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
      at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
      at java.base/java.lang.Thread.run(Thread.java:834)


      Code related to "com.sap.components.controls.html.utils.Helpers":
      package com.sap.components.controls.html.utils;

      import java.util.concurrent.Callable;
      import java.util.concurrent.CountDownLatch;
      import java.util.concurrent.TimeUnit;
      import java.util.concurrent.atomic.AtomicReference;
      import javafx.application.Platform;


      /**
       * Title: <TBD>
       * Description: <TBD>
       * Copyright: Copyright (c) 2004-2014
       * Company: SAP AG
       *
       * @author Mykola Gorbarov (d043357)
       * @version 1.0 (In Support since 2014)
       */

      public class Helpers {

          /**
           * Synchronously execute task on FX user thread and return result.
           *
           * @param task to execute on FX user thread
           * @return result of the task
           */
          public static <T> T doTask(final Callable<T> task) {
              final CountDownLatch barrier = new CountDownLatch(1);
              final AtomicReference<T> resultRef = new AtomicReference<T>();

              Runnable r = new Runnable() {

                  public void run() {
                      try {
                          resultRef.set(task.call());
                      } catch (Throwable t) {
                          t.printStackTrace();
                      } finally {
                          barrier.countDown();
                      }
                  }
              };

              if (Platform.isFxApplicationThread()) {
                  r.run();
              } else {
                  Platform.runLater(r);
              }

              while (barrier.getCount() > 0) {
                  try {
                      barrier.await();
                  } catch (InterruptedException e) {
                      e.printStackTrace();
                  }
              }

              return resultRef.get();
          }


      REGRESSION : Last worked in version 11.0.5

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Bit complex, need Eclipse, GUI with JavaFX - you can embed easy swing applicaiton with javafx html control via jfxpanel.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      No exception

      CUSTOMER SUBMITTED WORKAROUND :
      So far, no workaround

      FREQUENCY : always


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            • Assignee:
              tschindl Tom Schindl
              Reporter:
              webbuggrp Webbug Group
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              Dates

              • Created:
                Updated: