java.lang.NullPointerException
	at javax.swing.JList$1.getSize(JList.java:425)
	at javax.swing.plaf.basic.BasicListUI.updateLayoutState(BasicListUI.java:1319)
	at javax.swing.plaf.basic.BasicListUI.maybeUpdateLayoutState(BasicListUI.java:1288)
	at javax.swing.plaf.basic.BasicListUI.getPreferredSize(BasicListUI.java:560)
	at javax.swing.JComponent.getPreferredSize(JComponent.java:1627)
	at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:769)
	at java.awt.Container.layout(Container.java:1432)
	at java.awt.Container.doLayout(Container.java:1421)
	at java.awt.Container.validateTree(Container.java:1519)
	at java.awt.Container.validateTree(Container.java:1526)
	at java.awt.Container.validateTree(Container.java:1526)
	at java.awt.Container.validateTree(Container.java:1526)
	at java.awt.Container.validateTree(Container.java:1526)
	at java.awt.Container.validate(Container.java:1491)
	at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:639)
[catch] at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:127)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)