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Re: Exception when unlocking windows' screensaver [message #662183]

Tue, 29 March 2011 16:01

Prakash G.R.

Messages: 621
Registered: July 2009

Senior Member

On 29/03/11 8:11 PM, Marco Maccaferri wrote:
> Hi.
>
> One of our users sometimes gets a Graphic is disposed exception when he
> unlocks the screensaver while our RCP application is running. To be
> clear, the user leaves the PC on with our application running at night,
> the screensaver starts and when he returns back the next day and unlocks
> the screensaver the error pops out. The application then shows some
> other weird behaviour but I think it is all related to that graphic
> disposed error.
>
> This is the stack trace:
>
> org.eclipse.swt.SWTException: Graphic is disposed
> at org.eclipse.swt.SWT.error(SWT.java:3884)
> at org.eclipse.swt.SWT.error(SWT.java:3799)
> at org.eclipse.swt.SWT.error(SWT.java:3770)
> at org.eclipse.swt.graphics.Image.getBounds(Image.java:1154)
> at org.eclipse.swt.custom.CTabItem.drawSelected(CTabItem.java:3 77)
> at org.eclipse.swt.custom.CTabItem.onPaint(CTabItem.java:807)
> at org.eclipse.swt.custom.CTabFolder.drawTabArea(CTabFolder.jav a:1147)
> at org.eclipse.swt.custom.CTabFolder.onPaint(CTabFolder.java:23 06)
> at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.j ava:328)
> at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java :84)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1012)
> at org.eclipse.swt.widgets.Composite.WM_PAINT(Composite.java:14 25)
> at org.eclipse.swt.widgets.Control.windowProc(Control.java:4001 )
> at org.eclipse.swt.widgets.Display.windowProc(Display.java:4602 )
> at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
> at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:24 10)
> at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java :3471)
> at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.jav a:2405)
> at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
> at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:22 21)
> at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
> at
> org.eclipse.core.databinding.observable.Realm.runWithDefault (Realm.java:332)
>
> at
> org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Work bench.java:493)
> at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.j ava:149)
> at com.rtrms.amoeba.internal.Application.run(Application.java:2 5)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at
> org.eclipse.equinox.internal.app.EclipseAppContainer.callMet hodWithException(EclipseAppContainer.java:574)
>
> at
> org.eclipse.equinox.internal.app.EclipseAppHandle.run(Eclips eAppHandle.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(EclipseS tarter.java:368)
>
> at
> org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseS tarter.java:179)
>
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java: 559)
> at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
> at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
> at org.eclipse.equinox.launcher.Main.main(Main.java:1287)
>
> The exception is caused by a WM_PAINT event, I guess this is a general
> redraw caused by the screensaver. I can't figure out if it is caused by
> something the application is doing or if it is a framework bug. The
> application does some background tasks over night involving also closing
> and reopening views automatically but it doesn't dispose anything on its
> own.
>
> Has anyone encountered something similar ?
>
> Regards,
> Marco.

This belongs to swt forum. CC-ing...

--
- Prakash
Platform UI Team, IBM

www.eclipse-tips.com

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Re: Exception when unlocking windows' screensaver [message #662381 is a reply to message #662183]

Wed, 30 March 2011 13:15

Lakshmi P Shanmugam

Messages: 279
Registered: July 2009
Location: India

Senior Member

Hi,

Looks like the image set on the CTabItem has been disposed off early (i.e, while it is still set on the CTabItem). It could be getting disposed in the application code. You need to debug to see where or how the image is being disposed off early.

Lakshmi P Shanmugam

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