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java.lang.NullPointerException at org.springframework.ide.eclipse.webflow.ui.graph.parts.StateTransitionPart.contributeToGraph(StateTransitionPart.java:104) at org.springframework.ide.eclipse.webflow.ui.graph.parts.ActionStatePart.contributeEdgesToGraph(ActionStatePart.java:65) at org.springframework.ide.eclipse.webflow.ui.graph.parts.AbstractStatePart.contributeEdgesToGraph(AbstractStatePart.java:165) at org.springframework.ide.eclipse.webflow.ui.graph.parts.GraphLayoutManager.layout(GraphLayoutManager.java:76) at org.eclipse.draw2d.Figure.layout(Figure.java:1029) at org.eclipse.draw2d.Figure.validate(Figure.java:1735) at org.springframework.ide.eclipse.webflow.ui.graph.parts.GraphLayoutManager.calculatePreferredSize(GraphLayoutManager.java:54) at org.eclipse.draw2d.AbstractLayout.getPreferredSize(AbstractLayout.java:93) at org.eclipse.draw2d.AbstractLayout.getMinimumSize(AbstractLayout.java:79) at org.eclipse.draw2d.Figure.getMinimumSize(Figure.java:707) at org.eclipse.draw2d.StackLayout.calculateMinimumSize(StackLayout.java:44) at org.eclipse.draw2d.AbstractHintLayout.getMinimumSize(AbstractHintLayout.java:68) at org.eclipse.draw2d.Figure.getMinimumSize(Figure.java:707) at org.eclipse.draw2d.StackLayout.calculateMinimumSize(StackLayout.java:44) at org.eclipse.draw2d.AbstractHintLayout.getMinimumSize(AbstractHintLayout.java:68) at org.eclipse.draw2d.Figure.getMinimumSize(Figure.java:707) at org.eclipse.draw2d.StackLayout.calculateMinimumSize(StackLayout.java:44) at org.eclipse.draw2d.AbstractHintLayout.getMinimumSize(AbstractHintLayout.java:68) at org.eclipse.draw2d.Figure.getMinimumSize(Figure.java:707) at org.eclipse.draw2d.ScalableLayeredPane.getMinimumSize(ScalableLayeredPane.java:45) at org.eclipse.draw2d.StackLayout.calculateMinimumSize(StackLayout.java:44) at org.eclipse.draw2d.AbstractHintLayout.getMinimumSize(AbstractHintLayout.java:68) at org.eclipse.draw2d.Figure.getMinimumSize(Figure.java:707) at org.eclipse.draw2d.ViewportLayout.calculatePreferredSize(ViewportLayout.java:65) at org.eclipse.draw2d.AbstractLayout.getPreferredSize(AbstractLayout.java:93) at org.eclipse.draw2d.AbstractHintLayout.getPreferredSize(AbstractHintLayout.java:85) at org.eclipse.draw2d.Figure.getPreferredSize(Figure.java:735) at org.eclipse.draw2d.ScrollPaneSolver.solve(ScrollPaneSolver.java:75) at org.eclipse.draw2d.FigureCanvas.layoutViewport(FigureCanvas.java:238)