| NPE when initialising GraphicalEditor [message #668200] |
Wed, 04 May 2011 09:33  |
 Pewterfish
Messages: 2
Registered: May 2011 |
Junior Member |
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Hi folk,
I'm attempting to build a GEF-based model editor in an RCP application, and hitting a little trouble. I'm following the guide located at http://www.ibm.com/developerworks/library/os-eclipse-gef11/ (this is my first GEF project), and it's mostly been pretty straightforward. However, now I've finished defining editparts and writing figure drawing code, and it's time to pull it all together... and it doesn't work.
I've subclassed GraphicalEditor to create an editor (at the moment I'm just giving it an EditPartFactory and a Model, as recommended in the IBM tutorial), and am displaying it on a View. However, when I try to instantiate this editor, I get a null-pointer exception in GraphicallEditor.hookGraphicalViewer(), which appears to be coming from a getSite() call that returns null. The entire stack trace is posted below.
I'm using Eclipse Helios and GEF 3.7.0 (upgraded from 3.6.2 in the hopes of a bugfix that didn't materialise).
Can anyone shed any light on what's going wrong here? I'm a fairly experienced Java programmer but am comparatively new to Eclipse RCP/GEF, so I suspect I'm making a simple but non-obvious mistake 
| Quote: | java.lang.NullPointerException
at org.eclipse.gef.ui.parts.GraphicalEditor.hookGraphicalViewer (GraphicalEditor.java:332)
at org.eclipse.gef.ui.parts.GraphicalEditor.createGraphicalView er(GraphicalEditor.java:157)
at org.eclipse.gef.ui.parts.GraphicalEditorWithPalette.createPa rtControl(GraphicalEditorWithPalette.java:63)
at gefexperiment.ReqAnalyserView.createPartControl(ReqAnalyserV iew.java:36)
at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewR eference.java:375)
at org.eclipse.ui.internal.ViewReference.createPart(ViewReferen ce.java:229)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(Workb enchPartReference.java:595)
at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:31 3)
at org.eclipse.ui.internal.ViewPane.setVisible(ViewPane.java:52 9)
at org.eclipse.ui.internal.presentations.PresentablePart.setVis ible(PresentablePart.java:180)
at org.eclipse.ui.internal.presentations.util.PresentablePartFo lder.select(PresentablePartFolder.java:270)
at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrd er.select(LeftToRightTabOrder.java:65)
at org.eclipse.ui.internal.presentations.util.TabbedStackPresen tation.selectPart(TabbedStackPresentation.java:473)
(...and so on back to org.eclipse.equinox.launcher.Main)
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