I reverse engineered a UML project from an existing project created with
NetBeans 5.0. I created a new class diagram and added a few classes to it. I
then added a package element for one of the classes and moved a class into this
package element (the class was already in this package in the original source).
I moved the class to the lower-right corner of the package box so it was
partially out of the package (trying to get rid of the Nested Link icon) and got
the following exception:

java.lang.NullPointerException
	at com.tomsawyer.editor.ui.TSEEdgeUI.drawBendOutlines(DashoA9*..)
	at com.tomsawyer.editor.ui.TSEEdgeUI.drawBendOutlines(DashoA9*..)
	at com.tomsawyer.editor.tool.TSEMoveSelectedTool.paint(DashoA9*..)
	at com.tomsawyer.editor.TSEInnerCanvas.paintComponent(DashoA9*..)
	at javax.swing.JComponent.paint(JComponent.java:1005)
	at javax.swing.JLayeredPane.paint(JLayeredPane.java:559)
	at javax.swing.JComponent.paintChildren(JComponent.java:842)
	at javax.swing.JComponent.paint(JComponent.java:1014)
	at javax.swing.JComponent.paintChildren(JComponent.java:842)
	at javax.swing.JComponent.paint(JComponent.java:1014)
	at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4963)
	at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4916)
	at javax.swing.JComponent._paintImmediately(JComponent.java:4859)
	at javax.swing.JComponent.paintImmediately(JComponent.java:4666)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:451)
[catch] at
javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:114)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
	at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
	at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)