The following methods

 javax.swing.plaf.basic.BasicToolBarUI.setBorderToNonRollover(Component c)
 javax.swing.plaf.basic.BasicToolBarUI.setBorderToRollover(Component c)
 javax.swing.plaf.basic.BasicToolBarUI.setBorderToNormal(Component c)

are overloaded in javax.swing.plaf.synth.SynthToolBarUI and do nothing. However they inherit the spec from BasicToolBarUI.
Extract from Ri is below:
-----------------------------------------------------------
    // Overloaded to do nothing so we can share listeners.
    /**
     * @inheritDoc
     */
    @Override
    protected void setBorderToNonRollover(Component c) {}

    // Overloaded to do nothing so we can share listeners.
    /**
     * @inheritDoc
     */
    @Override
    protected void setBorderToRollover(Component c) {}

    // Overloaded to do nothing so we can share listeners.
    /**
     * @inheritDoc
     */
    @Override
    protected void setBorderToNormal(Component c) {}
-----------------------------------------------------------

The fact that these methods do nothing should be reflected in the spec.
For now, for example, for one of these methods the spec says:

protected void setBorderToNonRollover(Component c)

 Description copied from class: BasicToolBarUI
 Sets the border of the component to have a non-rollover border which was created by the BasicToolBarUI.createNonRolloverBorder() method.