| Thread problem [message #149797] |
Thu, 02 September 2004 20:28  |
Eclipse User |
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Originally posted by: thomas.p.larsson.spray.se
Hello all,
I have some models in my GEF app that each implement Runnable. I have an
Menu action called run which creates a Thread for each model and starts
them.
At one point one model which has a label as its EditPart figure calls
firePropertyChange (I want the Labels text to be updated) but then I get
this error:
java.lang.NullPointerException
at
org.eclipse.draw2d.DeferredUpdateManager.queueWork(DeferredU pdateManager.java:146)
at
org.eclipse.draw2d.DeferredUpdateManager.addInvalidFigure(De ferredUpdateManager.java:96)
at org.eclipse.draw2d.Figure.revalidate(Figure.java:1212)
at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
at org.eclipse.draw2d.Label.setText(Label.java:594)
at editparts.LabelEditPart.refreshVisuals(LabelEditPart.java:48 )
at editparts.MyNodeEditPart.propertyChange(MyNodeEditPart.java: 67)
at
java.beans.PropertyChangeSupport.firePropertyChange(Property ChangeSupport.java:252)
at model.AbstractModel.firePropertyChange(AbstractModel.java:80 )
at model.LabelModel.run(LabelModel.java:50)
at java.lang.Thread.run(Thread.java:534)
I believe the error is because the method Display.findDisplay which
returns the display for which the current thread is the user interface
thread returns null, since the calling thread is one of my newly creates
ones. Does anyone have any idea how to get around this?
Thanks
-Thomas
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| Re: Thread problem [message #149807 is a reply to message #149797] |
Thu, 02 September 2004 20:53  |
| Eclipse User |
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Originally posted by: none.us.ibm.com
Figure's cannot be accessed from multiple threads. They are not
thread-safe. Use syncExec or asyncExec
"Thomas" <thomas.p.larsson@spray.se> wrote in message
news:ch7vp1$32q$1@eclipse.org...
>
> Hello all,
>
> I have some models in my GEF app that each implement Runnable. I have an
> Menu action called run which creates a Thread for each model and starts
> them.
> At one point one model which has a label as its EditPart figure calls
> firePropertyChange (I want the Labels text to be updated) but then I get
> this error:
> java.lang.NullPointerException
> at
>
org.eclipse.draw2d.DeferredUpdateManager.queueWork(DeferredU pdateManager.jav
a:146)
> at
>
org.eclipse.draw2d.DeferredUpdateManager.addInvalidFigure(De ferredUpdateMana
ger.java:96)
> at org.eclipse.draw2d.Figure.revalidate(Figure.java:1212)
> at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
> at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
> at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
> at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
> at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
> at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
> at org.eclipse.draw2d.Figure.revalidate(Figure.java:1214)
> at org.eclipse.draw2d.Label.setText(Label.java:594)
> at editparts.LabelEditPart.refreshVisuals(LabelEditPart.java:48 )
> at editparts.MyNodeEditPart.propertyChange(MyNodeEditPart.java: 67)
> at
>
java.beans.PropertyChangeSupport.firePropertyChange(Property ChangeSupport.ja
va:252)
> at model.AbstractModel.firePropertyChange(AbstractModel.java:80 )
> at model.LabelModel.run(LabelModel.java:50)
> at java.lang.Thread.run(Thread.java:534)
>
> I believe the error is because the method Display.findDisplay which
> returns the display for which the current thread is the user interface
> thread returns null, since the calling thread is one of my newly creates
> ones. Does anyone have any idea how to get around this?
>
> Thanks
> -Thomas
>
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