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Invalid thread access problem [message #128182] Thu, 16 April 2009 12:44 Go to next message
Eclipse UserFriend
Originally posted by: markus.wolf.nmmn.com

We have a problem with 'Invalid thread access' exceptions.
After some time clicking on our RWT application this exceptions occur.
Therefore I printed the displays thread and the current executing thread
to check them.
The result seems strange to me:


Current Displays Thread:
Thread[UIThread [615E4AB262B5F273689BB8AC9FA879DC],5,main]

Current Thread:
Thread[UIThread [615E4AB262B5F273689BB8AC9FA879DC],5,main]


The exception trace:
org.eclipse.swt.SWTException: Invalid thread access
at org.eclipse.swt.SWT.error(SWT.java:2572)
at org.eclipse.swt.SWT.error(SWT.java:2492)
at org.eclipse.swt.SWT.error(SWT.java:2463)
at org.eclipse.swt.widgets.Widget.error(Widget.java:832)
at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:762)
at org.eclipse.swt.custom.CTabFolder.getItemCount
(CTabFolder.java:276)
at org.eclipse.swt.custom.CTabItem.<init>(CTabItem.java:92)
at de.nmmn.iscontrol.rwt.ui.View.create(View.java:30)
at de.nmmn.iscontrol.rwt.ui.ViewPlaceholder.openView
(ViewPlaceholder.java:52)
at de.nmmn.iscontrol.rwt.action.OpenInBrowserAction.run
(OpenInBrowserAction.java:87)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:500 )
at
org.eclipse.jface.action.ActionContributionItem.handleWidget Selection
(ActionContributionItem.java:579)
at org.eclipse.jface.action.ActionContributionItem.access$2
(ActionContributionItem.java:496)
at org.eclipse.jface.action.ActionContributionItem$5.handleEven t
(ActionContributionItem.java:407)
at
org.eclipse.swt.internal.widgets.UntypedEventAdapter.dispatc hEvent
(UntypedEventAdapter.java:469)
at
org.eclipse.swt.internal.widgets.UntypedEventAdapter.widgetS elected
(UntypedEventAdapter.java:89)
at org.eclipse.swt.events.SelectionEvent.dispatchToObserver
(SelectionEvent.java:176)
at org.eclipse.rwt.internal.events.Event.processEvent
(Event.java:44)
at org.eclipse.swt.events.TypedEvent.processEvent
(TypedEvent.java:125)
at org.eclipse.swt.events.TypedEvent.executeNext
(TypedEvent.java:165)
at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.readAndDispa tch
(RWTLifeCycle.java:241)
at org.eclipse.swt.widgets.Display.readAndDispatch
(Display.java:721)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:836 )
at org.eclipse.jface.window.Window.open(Window.java:812)
at de.nmmn.iscontrol.rwt.Main.createUI(Main.java:81)
at org.eclipse.rwt.internal.lifecycle.EntryPointManager.createU I
(EntryPointManager.java:92)
at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.createUI
(RWTLifeCycle.java:228)
at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle
$UIThreadController.run(RWTLifeCycle.java:116)
at java.lang.Thread.run(Thread.java:619)




Does anyone observes the same problem? The threads seem to be the same
but the exception is thrown anyway.

Markus Wolf
--
NMMN - New Media Markets & Networks GmbH
Geschäftsführung: Kfm. Michael Schütt
Finanzamt HH-Altona UStID DE 812 699 852 HRB 71102 Hamburg
HypoVereinsbank - BLZ 200 300 00 - Konto-Nr. 156 29 82

http://www.nmmn.com Tel.: +49 40 284 118 -0
Langbehnstrasse 6 Entwicklung: -720
22761 Hamburg Fax: -999
Antw: Invalid thread access problem [message #128211 is a reply to message #128182] Thu, 16 April 2009 13:23 Go to previous messageGo to next message
Eclipse UserFriend
Originally posted by: admin.kabe-farben.ch

Hi Markus

i would suggest you search for statics in your code.

Regards
Andrej

>>> Markus Wolf<markus.wolf@nmmn.com> schrieb am 16.04.2009 um 14:44 in
Nachricht <gs797n$v6f$1@build.eclipse.org>:
> We have a problem with 'Invalid thread access' exceptions.
> After some time clicking on our RWT application this exceptions occur.
> Therefore I printed the displays thread and the current executing thread
>
> to check them.
> The result seems strange to me:
>
>
> Current Displays Thread:
> Thread[UIThread [615E4AB262B5F273689BB8AC9FA879DC],5,main]
>
> Current Thread:
> Thread[UIThread [615E4AB262B5F273689BB8AC9FA879DC],5,main]
>
>
> The exception trace:
> org.eclipse.swt.SWTException: Invalid thread access
> at org.eclipse.swt.SWT.error(SWT.java:2572)
> at org.eclipse.swt.SWT.error(SWT.java:2492)
> at org.eclipse.swt.SWT.error(SWT.java:2463)
> at org.eclipse.swt.widgets.Widget.error(Widget.java:832)
> at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:762)
> at org.eclipse.swt.custom.CTabFolder.getItemCount
> (CTabFolder.java:276)
> at org.eclipse.swt.custom.CTabItem.<init>(CTabItem.java:92)
> at de.nmmn.iscontrol.rwt.ui.View.create(View.java:30)
> at de.nmmn.iscontrol.rwt.ui.ViewPlaceholder.openView
> (ViewPlaceholder.java:52)
> at de.nmmn.iscontrol.rwt.action.OpenInBrowserAction.run
> (OpenInBrowserAction.java:87)
> at org.eclipse.jface.action.Action.runWithEvent(Action.java:500 )
> at
> org.eclipse.jface.action.ActionContributionItem.handleWidget Selection
> (ActionContributionItem.java:579)
> at org.eclipse.jface.action.ActionContributionItem.access$2
> (ActionContributionItem.java:496)
> at org.eclipse.jface.action.ActionContributionItem$5.handleEven t
> (ActionContributionItem.java:407)
> at
> org.eclipse.swt.internal.widgets.UntypedEventAdapter.dispatc hEvent
> (UntypedEventAdapter.java:469)
> at
> org.eclipse.swt.internal.widgets.UntypedEventAdapter.widgetS elected
> (UntypedEventAdapter.java:89)
> at org.eclipse.swt.events.SelectionEvent.dispatchToObserver
> (SelectionEvent.java:176)
> at org.eclipse.rwt.internal.events.Event.processEvent
> (Event.java:44)
> at org.eclipse.swt.events.TypedEvent.processEvent
> (TypedEvent.java:125)
> at org.eclipse.swt.events.TypedEvent.executeNext
> (TypedEvent.java:165)
> at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.readAndDispa tch
> (RWTLifeCycle.java:241)
> at org.eclipse.swt.widgets.Display.readAndDispatch
> (Display.java:721)
> at org.eclipse.jface.window.Window.runEventLoop(Window.java:836 )
> at org.eclipse.jface.window.Window.open(Window.java:812)
> at de.nmmn.iscontrol.rwt.Main.createUI(Main.java:81)
> at org.eclipse.rwt.internal.lifecycle.EntryPointManager.createU I
> (EntryPointManager.java:92)
> at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.createUI
> (RWTLifeCycle.java:228)
> at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle
> $UIThreadController.run(RWTLifeCycle.java:116)
> at java.lang.Thread.run(Thread.java:619)
>
>
>
>
> Does anyone observes the same problem? The threads seem to be the same
> but the exception is thrown anyway.
>
> Markus Wolf
Re: Invalid thread access problem [message #128225 is a reply to message #128182] Thu, 16 April 2009 13:25 Go to previous messageGo to next message
Eclipse UserFriend
Originally posted by: benjamin.wolff.web.de

Hi Markus,

somehow this smells like discouraged use of static objects. I also hab problems
with such 'strange' invalid thread accesses. The reason was that i wasn't aware
that objects, like widgets etc., which are declared as static are shared
between the hole application. So when several user used the application and
accessed the same static widget this exception occurs. So i hope you are aware
of this multi-session programming paradigm?!

HTH,
Ben



Markus Wolf schrieb:
> We have a problem with 'Invalid thread access' exceptions.
> After some time clicking on our RWT application this exceptions occur.
> Therefore I printed the displays thread and the current executing thread
> to check them.
> The result seems strange to me:
>
>
> Current Displays Thread:
> Thread[UIThread [615E4AB262B5F273689BB8AC9FA879DC],5,main]
>
> Current Thread:
> Thread[UIThread [615E4AB262B5F273689BB8AC9FA879DC],5,main]
>
>
> The exception trace:
> org.eclipse.swt.SWTException: Invalid thread access
> at org.eclipse.swt.SWT.error(SWT.java:2572)
> at org.eclipse.swt.SWT.error(SWT.java:2492)
> at org.eclipse.swt.SWT.error(SWT.java:2463)
> at org.eclipse.swt.widgets.Widget.error(Widget.java:832)
> at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:762)
> at org.eclipse.swt.custom.CTabFolder.getItemCount
> (CTabFolder.java:276)
> at org.eclipse.swt.custom.CTabItem.<init>(CTabItem.java:92)
> at de.nmmn.iscontrol.rwt.ui.View.create(View.java:30)
> at de.nmmn.iscontrol.rwt.ui.ViewPlaceholder.openView
> (ViewPlaceholder.java:52)
> at de.nmmn.iscontrol.rwt.action.OpenInBrowserAction.run
> (OpenInBrowserAction.java:87)
> at org.eclipse.jface.action.Action.runWithEvent(Action.java:500 )
> at
> org.eclipse.jface.action.ActionContributionItem.handleWidget Selection
> (ActionContributionItem.java:579)
> at org.eclipse.jface.action.ActionContributionItem.access$2
> (ActionContributionItem.java:496)
> at org.eclipse.jface.action.ActionContributionItem$5.handleEven t
> (ActionContributionItem.java:407)
> at
> org.eclipse.swt.internal.widgets.UntypedEventAdapter.dispatc hEvent
> (UntypedEventAdapter.java:469)
> at
> org.eclipse.swt.internal.widgets.UntypedEventAdapter.widgetS elected
> (UntypedEventAdapter.java:89)
> at org.eclipse.swt.events.SelectionEvent.dispatchToObserver
> (SelectionEvent.java:176)
> at org.eclipse.rwt.internal.events.Event.processEvent
> (Event.java:44)
> at org.eclipse.swt.events.TypedEvent.processEvent
> (TypedEvent.java:125)
> at org.eclipse.swt.events.TypedEvent.executeNext
> (TypedEvent.java:165)
> at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.readAndDispa tch
> (RWTLifeCycle.java:241)
> at org.eclipse.swt.widgets.Display.readAndDispatch
> (Display.java:721)
> at org.eclipse.jface.window.Window.runEventLoop(Window.java:836 )
> at org.eclipse.jface.window.Window.open(Window.java:812)
> at de.nmmn.iscontrol.rwt.Main.createUI(Main.java:81)
> at org.eclipse.rwt.internal.lifecycle.EntryPointManager.createU I
> (EntryPointManager.java:92)
> at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.createUI
> (RWTLifeCycle.java:228)
> at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle
> $UIThreadController.run(RWTLifeCycle.java:116)
> at java.lang.Thread.run(Thread.java:619)
>
>
>
>
> Does anyone observes the same problem? The threads seem to be the same
> but the exception is thrown anyway.
>
> Markus Wolf
Re: Invalid thread access problem [message #128249 is a reply to message #128225] Thu, 16 April 2009 15:21 Go to previous message
Eclipse UserFriend
Originally posted by: markus.wolf.nmmn.com

Hi Ben,

> somehow this smells like discouraged use of static objects. I also hab
> problems with such 'strange' invalid thread accesses. The reason was
> that i wasn't aware that objects, like widgets etc., which are declared
> as static are shared between the hole application. So when several user
> used the application and accessed the same static widget this exception
> occurs. So i hope you are aware of this multi-session programming
> paradigm?!
>
thanks for reminding me. I was aware of the problem and it was not really
a static widget, but a singleton helper class chaching some widgets...

Now everything runs fine. :)

Thanks again.
Markus Wolf
--
NMMN - New Media Markets & Networks GmbH
Geschäftsführung: Kfm. Michael Schütt
Finanzamt HH-Altona UStID DE 812 699 852 HRB 71102 Hamburg
HypoVereinsbank - BLZ 200 300 00 - Konto-Nr. 156 29 82

http://www.nmmn.com Tel.: +49 40 284 118 -0
Langbehnstrasse 6 Entwicklung: -720
22761 Hamburg Fax: -999
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