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carlos.lucasius@canada 1998-03-19:
Bug reported by Corel (licensee) for JFC1.1 using JDK1.1.4 on WINNT4.0.
Corel: "Very critical bug for our product - requires immediate attention."

a. Open a new document for editing in a JEditorPane (for HTML content)
b. Start typing some text
c. Move the cursor to the start of the document (position 0)
d. Start typing
e. The following error occurs:

Exception occurred during event dispatching:
com.sun.java.swing.text.StateInvariantError: infinite loop in formatting
        at com.sun.java.swing.text.ParagraphView.rebuildRows(ParagraphView.java:163)
        at com.sun.java.swing.text.ParagraphView.layout(ParagraphView.java:127)
        at com.sun.java.swing.text.ParagraphView.removeUpdate(ParagraphView.java:661)
        at com.sun.java.swing.text.BoxView.removeUpdate(BoxView.java:358)
        at com.sun.java.swing.text.DefaultTextUI$RootView.removeUpdate(DefaultTextUI.java: 848)
        at com.sun.java.swing.text.DefaultTextUI$UpdateHandler.removeUpdate(DefaultTextUI.java:1065)
        at com.sun.java.swing.text.AbstractDocument.fireRemoveUpdate(AbstractDocument.java:185)
        at com.sun.java.swing.text.AbstractDocument.remove(AbstractDocument.java :371)
        at com.sun.java.swing.text.JTextComponent.replaceSelection(JTextComponent.java:758)
        at com.sun.java.swing.text.DefaultEditorKit$DefaultKeyTypedAction.actionPerformed(DefaultEditorKit.java:650)
        at com.sun.java.swing.text.JTextComponent.processComponentKeyEvent(JTextComponent.java:1026)
        at com.sun.java.swing.JComponent.processKeyEvent(JComponent.java:1256)
        at java.awt.Component.processEvent(Component.java:2138)
        at java.awt.Container.processEvent(Container.java:890)
        at java.awt.Component.dispatchEventImpl(Component.java:1764)
        at java.awt.Container.dispatchEventImpl(Container.java:935)
        at java.awt.Component.dispatchEvent(Component.java:1704)
        at java.awt.LightweightDispatcher.processKeyEvent(Container.java:1407)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1393)
        at java.awt.Container.dispatchEventImpl(Container.java:922)
        at java.awt.Window.dispatchEventImpl(Window.java:441)
        at java.awt.Component.dispatchEvent(Component.java:1704)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:63)

NOTE: The same also occurs if you open an already existing document, move to the start and start typing.