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NullPointerException when Instanciating [message #249411]

Wed, 24 June 2009 05:10

Eclipse User

Hi everyone!

i'm having trouble to instantiate a Palette in a my
ScrollingGraphicalViewer.

I followed the steps in the Gef Redbook but when i try to register the
palette at my EditDomain i get a null pointer exception:

java.lang.NullPointerException at
org.eclipse.gef.ui.palette.PaletteViewer.setActiveTool(Palet teViewer.java:381)
at org.eclipse.gef.EditDomain.loadDefaultTool(EditDomain.java:1 92)
at org.eclipse.gef.EditDomain.setPaletteRoot(EditDomain.java:34 3)
at
project.ui.gui.editors.CanvasGefEditor.createPaletteViewer(C anvasGefEditor.java:430)

Here is the createPaletteViewer methode:

private PaletteViewer createPaletteViewer(Composite parent) {
// create graphical viewer
PaletteViewer viewer = new PaletteViewer();
viewer.createControl(parent);

// hook the viewer into the EditDomain (only one palette per
EditDomain)
getEditDomain().setPaletteViewer(viewer);

// important: the palette is initialized via EditDomain
getEditDomain().setPaletteRoot(getPaletteRoot());

return viewer;
}

and here the setActiveTool:

public void setActiveTool(ToolEntry newMode) {
if (newMode == null)
newMode = getPaletteRoot().getDefaultEntry();
if (activeEntry != null)
getToolEntryEditPart(activeEntry).setToolSelected(false);
activeEntry = newMode;
if (activeEntry != null) {
ToolEntryEditPart editpart = getToolEntryEditPart(activeEntry);
editpart.setToolSelected(true);
}
fireModeChanged();
}

So does anybody have a clue?

Thanks in Advance!
Chris

Re: NullPointerException when Instanciating [message #249424 is a reply to message #249411]

Wed, 24 June 2009 19:41

Eclipse User

Perhaps you are seeing this bug which is fixed in 3.5:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=270028

-Ben

Chris Turner wrote:
> Hi everyone!
>
> i'm having trouble to instantiate a Palette in a my
> ScrollingGraphicalViewer.
>
> I followed the steps in the Gef Redbook but when i try to register the
> palette at my EditDomain i get a null pointer exception:
> java.lang.NullPointerException at
> org.eclipse.gef.ui.palette.PaletteViewer.setActiveTool(Palet teViewer.java:381)
>
> at org.eclipse.gef.EditDomain.loadDefaultTool(EditDomain.java:1 92)
> at org.eclipse.gef.EditDomain.setPaletteRoot(EditDomain.java:34 3)
> at
> project.ui.gui.editors.CanvasGefEditor.createPaletteViewer(C anvasGefEditor.java:430)
>
>
>
> Here is the createPaletteViewer methode:
>
>
> private PaletteViewer createPaletteViewer(Composite parent) {
> // create graphical viewer
> PaletteViewer viewer = new PaletteViewer();
> viewer.createControl(parent);
>
> // hook the viewer into the EditDomain (only one palette per
> EditDomain)
> getEditDomain().setPaletteViewer(viewer);
>
> // important: the palette is initialized via EditDomain
> getEditDomain().setPaletteRoot(getPaletteRoot());
>
> return viewer;
> }
>
>
> and here the setActiveTool:
>
> public void setActiveTool(ToolEntry newMode) {
> if (newMode == null)
> newMode = getPaletteRoot().getDefaultEntry();
> if (activeEntry != null)
> getToolEntryEditPart(activeEntry).setToolSelected(false);
> activeEntry = newMode;
> if (activeEntry != null) {
> ToolEntryEditPart editpart = getToolEntryEditPart(activeEntry);
> editpart.setToolSelected(true);
> }
> fireModeChanged();
> }
>
> So does anybody have a clue?
>
>
> Thanks in Advance! Chris

Re: NullPointerException when Instanciating [message #249426 is a reply to message #249411]

Thu, 25 June 2009 23:32

Eclipse User

Hi,

Set palette root before you set the palette for edit domain. When you set
the palette viewer for the edit domain palette viewer has no contents - no
editparts, so you get an NPE. Set the palette root on the palette viewer
and the attach to the domain.

Cheers,
Alex

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