In method javax.swing.plaf.basic.BasicLookAndFeel.uninitialize() is an assignment to a local object called tk, but it is never used in the method.

   /**
     * UIManager.setLookAndFeel calls this method just
     * before we're replaced by a new default look and feel.
     */
    public void uninitialize() {
        Toolkit tk = Toolkit.getDefaultToolkit(); // <------ here
        if(invocator != null) {
            AccessController.doPrivileged(invocator);
            invocator = null;
        }
    }

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