for (ResultsVersion rv : versions) {
	     for (Candidate c : rv.getCandidates()) {
		IFigure figure =FigureFactory.makeFigure(c);          
            HERE>> cNode = new CandidateNode(graph,SWT.NONE,figure,c);
	        cNode.setData(c);
		candidateNodes.add(cNode);		
	   }		
	}

public class CandidateNode extends GraphNode{

	private Object extraData=null;
	
	public CandidateNode(IContainer graph, int style,IFigure figure,Object extraData) {
		super(graph, style,figure);
		this.extraData = extraData;
	}
	
	protected IFigure createFigureForModel() {
		return (IFigure) this.getData();
	}

!ENTRY org.eclipse.ui 4 0 2013-05-29 22:09:16.662
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.LinkageError: loader constraint violation: when resolving overridden method "org.cs3.jtransformer.analysis.quality.ui.CandidateNode.createFigureForModel()Lorg/eclipse/draw2d/IFigure;" the class loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) of the current class, org/cs3/jtransformer/analysis/quality/ui/CandidateNode, and its superclass loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader), have different Class objects for the type teNode.createFigureForModel()Lorg/eclipse/draw2d/IFigure; used in the signature
	at org.cs3.jtransformer.analysis.quality.ui.ResultsModelGraph.createGraphNodes(ResultsModelGraph.java:71)
	at org.cs3.jtransformer.analysis.quality.ui.ResultsModelGraph.createEvolutionGraph(ResultsModelGraph.java:131)
	at org.cs3.jtransformer.analysis.quality.AQuA.updateGraph(AQuA.java:892)
	at org.cs3.jtransformer.analysis.quality.AQuA.visualize(AQuA.java:883)
	at org.cs3.jtransformer.analysis.quality.AQuA.updateCheckState(AQuA.java:870)
	at org.cs3.jtransformer.analysis.quality.AQuA$25.selected(AQuA.java:1243)
	at org.cs3.jtransformer.analysis.quality.AQuA$25.widgetSelected(AQuA.java:1247)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1029)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:923)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.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(EclipseStarter.java:353)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
	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:629)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1414)