Typos in JLayer files:

javax.swing.JLayer:
    line 804 * First, implementatation of this method iterates through
    should be
    line 804 * First, implementation of this method iterates through

    line 462 * The following example shows how to correclty use this method
    should be
    line 462 * The following example shows how to correctly use this method

javax.swing.plaf.LayerUI:
    line 41 * {@link #paint(java.awt.Graphics, javax.swing.JComponent)} method performes the
    should be
    line 41 * {@link #paint(java.awt.Graphics, javax.swing.JComponent)} method performs the

    lines 166,198,230,262,294,326,358,390,422 * public void unistallUI(JComponent c) {
    should be
    lines 166,198,230,262,294,326,358,390,422 * public void uninstallUI(JComponent c) {

    Not sure about "unregisters" in:
    line 462 * The default implementation unregisters the property change listener
    line 463 * for the passed JLayer component.

    line 492 * @return maximun size for the passed {@code JLayer}
    should be
    line 492 * @return maximum size for the passed {@code JLayer}

Unnecessary imports in javax.swing.plaf.LayerUI:
    import javax.accessibility.Accessible;
    import javax.swing.plaf.ComponentUI;