| SelectEditPartTracker NullPointerException in handleButtonUp [message #245207] |
Wed, 27 August 2008 16:00  |
 Lisete 
Messages: 8
Registered: July 2009 |
Junior Member |
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I get a NullPointerException in the method handleButtonUp, because
getCurrentViewer() is null.
I want to give the user some feedback about a task that's being performed,
so to report the progress and allow the cancellation, I've used a
ProgressMonitorDialog.
This is the situation: when the user clicks a node in my editor I return
some info about that node. This exception only happens when, after I
select several nodes, I click in one of them... When I click in only one,
the progress bar and all the information are displayed.
I believe this happens because after the progress bar is shown the main
window looses focus and the variable currentViewer (which holds currently
selected objects) is set to null. I just don't understand why... And I
don't understand the different behavior that I described above!! Why,
why?? The progress bar is built in both situations, in both, the variable
currentViewer is set to null...
Can anyone help?
This is the obtained exception:
Caused by: java.lang.NullPointerException
at
org.eclipse.gef.tools.SelectEditPartTracker.handleButtonUp(S electEditPartTracker.java:115)
at
org.eclipse.gef.tools.DragEditPartsTracker.handleButtonUp(Dr agEditPartsTracker.java:336)
at org.eclipse.gef.tools.AbstractTool.mouseUp(AbstractTool.java :1053)
at org.eclipse.gef.tools.SelectionTool.mouseUp(SelectionTool.ja va:544)
at org.eclipse.gef.EditDomain.mouseUp(EditDomain.java:259)
at
org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouse Released(DomainEventDispatcher.java:374)
at
org.eclipse.draw2d.LightweightSystem$EventHandler.mouseUp(Li ghtweightSystem.java:538)
at
org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListe ner.java:206)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java :66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.ja va:3682)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java :3293)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.jav a:2389)
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| Re: SelectEditPartTracker NullPointerException in handleButtonUp [message #245301 is a reply to message #245207] |
Tue, 02 September 2008 00:55  |
Felix L J Mayer
Messages: 202
Registered: July 2009 |
Senior Member |
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Maybe the progress dialog gets the focus, so there is no graphical viewer?
"Lisete " <lisete.rodrigues.santos@gmail.com> wrote in message
news:ca1cc0791bb58c0c23d0d02b457344ce$1@www.eclipse.org...
>I get a NullPointerException in the method handleButtonUp, because
>getCurrentViewer() is null. I want to give the user some feedback about a
>task that's being performed, so to report the progress and allow the
>cancellation, I've used a ProgressMonitorDialog. This is the situation:
>when the user clicks a node in my editor I return some info about that
>node. This exception only happens when, after I select several nodes, I
>click in one of them... When I click in only one, the progress bar and all
>the information are displayed.
>
> I believe this happens because after the progress bar is shown the main
> window looses focus and the variable currentViewer (which holds currently
> selected objects) is set to null. I just don't understand why... And I
> don't understand the different behavior that I described above!! Why,
> why?? The progress bar is built in both situations, in both, the variable
> currentViewer is set to null...
>
> Can anyone help?
>
> This is the obtained exception:
>
> Caused by: java.lang.NullPointerException
> at
> org.eclipse.gef.tools.SelectEditPartTracker.handleButtonUp(S electEditPartTracker.java:115)
> at
> org.eclipse.gef.tools.DragEditPartsTracker.handleButtonUp(Dr agEditPartsTracker.java:336)
> at org.eclipse.gef.tools.AbstractTool.mouseUp(AbstractTool.java :1053)
> at org.eclipse.gef.tools.SelectionTool.mouseUp(SelectionTool.ja va:544)
> at org.eclipse.gef.EditDomain.mouseUp(EditDomain.java:259)
> at
> org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouse Released(DomainEventDispatcher.java:374)
> at
> org.eclipse.draw2d.LightweightSystem$EventHandler.mouseUp(Li ghtweightSystem.java:538)
> at
> org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListe ner.java:206)
> at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java :66)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)
> at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.ja va:3682)
> at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java :3293)
> at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.jav a:2389)
>
>
>
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| Re: SelectEditPartTracker NullPointerException in handleButtonUp [message #245334 is a reply to message #245321] |
Wed, 03 September 2008 22:02 |
Eclipse User |
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Originally posted by: felix.mayer.erdas.com
I don't think you are missing something, I just didn't understand the
problem.
This sounds like a tricky debugging issue to me and not something anybody
here can help you with (of course I may be wrong). I would try to use the
debugger to find out when the graphical viewer is set to null; you might
have to use the enable condition on the breakpoint properties to only
trigger the breakpoint when needed.
"Lisete " <lisete.rodrigues.santos@gmail.com> wrote in message
news:b379f831a86ba22d7438f22f2f1c9ef6$1@www.eclipse.org...
> Hi,
> Yes, I've noticed that. But I just don't understand why this
> nullPointerException only happens when, after a selection of several
> nodes, I click in one of them... When I click in only one (without a
> previous "multiple" selection), the progress bar and all the information
> are displayed.
>
> In this last situation, the progress dialog also gets the focus and then
> there is no graphical viewer, isn't?
>
> I am missing something?
>
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