| "Widget is disposed" when TreeColumnLayout is running [message #989251] |
Wed, 05 December 2012 05:58  |
 Knut Wannheden
Messages: 283
Registered: July 2009 |
Senior Member |
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Hi all,
I just hit a problem which I think in fact is related to an SWT bug
(similar to what's reported here:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=288261). The problem I
face is that I have an SWTBot test which does some expanding and
colapsing in a tree and after the test is torn down I get the following
exception logged:
org.eclipse.swt.SWTException: Failed to execute runnable
(org.eclipse.swt.SWTException: Widget is disposed)
at org.eclipse.swt.SWT.error(SWT.java:4282)
at org.eclipse.swt.SWT.error(SWT.java:4197)
at
org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:138)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4140)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
at
org.eclipse.swtbot.eclipse.core.UITestApplication.start(UITestApplication.java:54)
at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Caused by: org.eclipse.swt.SWTException: Widget is disposed
at org.eclipse.swt.SWT.error(SWT.java:4282)
at org.eclipse.swt.SWT.error(SWT.java:4197)
at org.eclipse.swt.SWT.error(SWT.java:4168)
at org.eclipse.swt.widgets.Widget.error(Widget.java:468)
at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:340)
at org.eclipse.swt.widgets.Control.update(Control.java:4369)
at
org.eclipse.jface.layout.TreeColumnLayout$1.run(TreeColumnLayout.java:57)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at
org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
... 24 more
AFAICT the problem is that the TreeColumnLayout does an
Display#asyncExec() with a Runnable which doesn't check if the tree
widget has been disposed. But apparently it has already been disposed by
the test's teardown. Here is the relevant snippet from
TreeColumnLayout.java (lines 53-62):
private void update(final Tree tree) {
tree.getDisplay().asyncExec(new Runnable() {
public void run() {
tree.update();
tree.getParent().layout();
}
});
}
I will make sure to report this SWT bug. But in the meantime I would
like to know if anyone can think of a workaround in the test case?
(Please no sleep() hints.) I am thinking about scheduling a no-op using
Display#asyncExec(). Although I don't know if asyncExec() has a fair
scheduling policy or not.
Regards,
--knut
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