I've run FindBugs on AWT code and found number of code problems:

src/share/classes/java/awt/TextComponent.java

selectAll() declares and never uses variable text.

src/share/classes/java/awt/EventQueue.java

postEvent(AWTEvent theEvent, int priority) declares and never uses variable source.

src/solaris/classes/sun/awt/X11/XDecoratedPeer.java

two unused variables.

src/solaris/classes/sun/awt/X11/XMenuWindow.java

Unneeded check for null.

src/solaris/classes/sun/awt/X11/XWindowPeer.java

unused if().

src/solaris/classes/sun/awt/X11/XWindow.java

unneeded check for null (the variable is dereferenced earlier).

src/solaris/classes/sun/awt/X11/XAWTLookAndFeel.java

unused variable serifPlain12 in initComponentDefaults()