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java.lang.ArrayIndexOutOfBoundsException: -1 at java.util.ArrayList.remove(ArrayList.java:393) at org.eclipse.draw2d.graph.ShortestPathRouter.internalRemoveObstacle(ShortestPathRouter.java:379) at org.eclipse.draw2d.graph.ShortestPathRouter.removeObstacle(ShortestPathRouter.java:594) at org.springframework.ide.eclipse.webflow.ui.graph.parts.ShortestPathConnectionRouter.removeChild(ShortestPathConnectionRouter.java:260)