FULL PRODUCT VERSION :
java version "1.6.0_14"
Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Microsoft® Windows Vista™ Home Premium


A DESCRIPTION OF THE PROBLEM :
This crash occurs when dragging a mouse in a text field. I was dragging the mouse to show list of history. I could not create a standalone Java test to reproduce this crash. Here is the stack trace

ArrayIndexOutOfBoundsException {class java.lang.ArrayIndexOutOfBoundsException "24"
 at sun.font.FontDesignMetrics.charsWidth(FontDesignMetrics.java:492)
 at javax.swing.text.Utilities.getTabbedTextOffset(Utilities.java:381)
 at javax.swing.text.Utilities.getTabbedTextOffset(Utilities.java:302)
 at javax.swing.text.Utilities.getTabbedTextOffset(Utilities.java:286)
 at javax.swing.text.PlainView.viewToModel(PlainView.java:403)
 at javax.swing.text.FieldView.viewToModel(FieldView.java:263)
 at javax.swing.plaf.basic.BasicTextUI$RootView.viewToModel(BasicTextUI.java:1540)
 at javax.swing.plaf.basic.BasicTextUI.viewToModel(BasicTextUI.java:1089)
 at javax.swing.text.DefaultCaret.moveCaret(DefaultCaret.java:311)
 at javax.swing.text.DefaultCaret.mouseDragged(DefaultCaret.java:565)
 at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:303)
 at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:302)
 at java.awt.Component.processMouseMotionEvent(Component.java:6311)
 at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3285)
 at java.awt.Component.processEvent(Component.java:6032)
 at java.awt.Container.processEvent(Container.java:2041)
 at java.awt.Component.dispatchEventImpl(Component.java:4630)
 at java.awt.Container.dispatchEventImpl(Container.java:2099)
 at java.awt.Component.dispatchEvent(Component.java:4460)
 at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
 at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4255)
 at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
 at java.awt.Container.dispatchEventImpl(Container.java:2085)
 at java.awt.Window.dispatchEventImpl(Window.java:2475)
 at java.awt.Component.dispatchEvent(Component.java:4460)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)


ERROR MESSAGES/STACK TRACES THAT OCCUR :
Stack trace
ArrayIndexOutOfBoundsException {class java.lang.ArrayIndexOutOfBoundsException "24"
 at sun.font.FontDesignMetrics.charsWidth(FontDesignMetrics.java:492)
 at javax.swing.text.Utilities.getTabbedTextOffset(Utilities.java:381)
 at javax.swing.text.Utilities.getTabbedTextOffset(Utilities.java:302)
 at javax.swing.text.Utilities.getTabbedTextOffset(Utilities.java:286)
 at javax.swing.text.PlainView.viewToModel(PlainView.java:403)
 at javax.swing.text.FieldView.viewToModel(FieldView.java:263)
 at javax.swing.plaf.basic.BasicTextUI$RootView.viewToModel(BasicTextUI.java:1540)
 at javax.swing.plaf.basic.BasicTextUI.viewToModel(BasicTextUI.java:1089)
 at javax.swing.text.DefaultCaret.moveCaret(DefaultCaret.java:311)
 at javax.swing.text.DefaultCaret.mouseDragged(DefaultCaret.java:565)
 at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:303)
 at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:302)
 at java.awt.Component.processMouseMotionEvent(Component.java:6311)
 at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3285)
 at java.awt.Component.processEvent(Component.java:6032)
 at java.awt.Container.processEvent(Container.java:2041)
 at java.awt.Component.dispatchEventImpl(Component.java:4630)
 at java.awt.Container.dispatchEventImpl(Container.java:2099)
 at java.awt.Component.dispatchEvent(Component.java:4460)
 at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
 at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4255)
 at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
 at java.awt.Container.dispatchEventImpl(Container.java:2085)
 at java.awt.Window.dispatchEventImpl(Window.java:2475)
 at java.awt.Component.dispatchEvent(Component.java:4460)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)

REPRODUCIBILITY :
This bug can be reproduced occasionally.