FULL PRODUCT VERSION :
java version "1.6.0_05"
Java(TM) SE Runtime Environment (build 1.6.0_05-b13)
Java HotSpot(TM) Client VM (build 10.0-b19, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
javax.swing.SwingUtilities.replaceUIInputMap() and javax.swing.SwingUtilities.replaceUIActionMap() do not actually remove previously installed maps as their Javadoc indicates.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create a JFrame with a single JButton.
2. Create a new javax.swing.ComponentInputMap and add two mappings:
  - When VK_ENTER is pressed, fire the "pressed" action.
  - When VK_ENTER is released, fire the "released" action.
3. Use SwingUtilities.replaceUIInputMap() to install the map onto the button using the JComponent.WHEN_IN_FOCUSED_WINDOW type.
4. Use SwingUtilities.replaceUIInputMap(), passing in a null third argument, to uninstall the previously installed map.
5. Press and release the ENTER key while the JFrame is focused.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The button should NOT activate because the second call to SwingUtilities.replaceUIInputMap() should have removed the input map that mapped VK_ENTER to the button.
ACTUAL -
The button DOES activate because SwingUtilities.replaceUIInputMap() does not actually do anything to alter the installed input maps.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.*;

public class UIMapTest {
    public static void main(String[] args) {
        // Create the test button
        JButton button = new JButton("Test");

        // Create an input map that maps ENTER to the button
        ComponentInputMap map = new ComponentInputMap(button);
        map.put(KeyStroke.getKeyStroke("pressed ENTER"), "pressed");
        map.put(KeyStroke.getKeyStroke("released ENTER"), "released");

        // Add the map
        SwingUtilities.replaceUIInputMap(button, JComponent.WHEN_IN_FOCUSED_WINDOW, map);

        // Attempt to remove the map
        SwingUtilities.replaceUIInputMap(button, JComponent.WHEN_IN_FOCUSED_WINDOW, null);

        // Show the frame
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(button);
        frame.pack();
        frame.setVisible(true);
    }
}
---------- END SOURCE ----------