There are dead links in Swing API documentation, which should be fixed:

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javax.swing.text.JTextComponent

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4529 public void addInputMethodListener(InputMethodListener l) {
The javadoc comment from the parent method JComponent.addInputMethodListener() is used. There is a link, which doesn't work for javax.swing.text package:
javax.swing.JComponent
5409 * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"


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javax.swing.text.Segment

File Not Found
262 public char charAt(int index) {
The javadoc comment from the interface method CharSequence.charAt() is used. There is a link, which doesn't work for javax.swing.text package:
java.lang.CharSequence
70 * <a href="Character.html#unicode">surrogate</a>, the surrogate