java.lang.ArrayIndexOutOfBoundsException: -1
        at javax.swing.text.BoxView.getOffset(BoxView.java:1084)
        at javax.swing.text.BoxView.childAllocation(BoxView.java:678)
        at javax.swing.text.CompositeView.getChildAllocation(CompositeView.java:215)
        at javax.swing.text.BoxView.getChildAllocation(BoxView.java:436)
        at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.calculateViewPosition(BasicTextUI.java:1978)
        at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.layoutContainer(BasicTextUI.java:1954)
        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.validate(Container.java:1491)
        at javax.swing.JViewport.validateView(JViewport.java:498)
        at javax.swing.JViewport.scrollRectToVisible(JViewport.java:372)
        at javax.swing.JComponent.scrollRectToVisible(JComponent.java:3063)
        at javax.swing.text.DefaultCaret.adjustVisibility(DefaultCaret.java:268)
        at javax.swing.text.DefaultCaret.repaintNewCaret(DefaultCaret.java:1296)
        at javax.swing.text.DefaultCaret$1.run(DefaultCaret.java:1270)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        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)