I have enabled the Java hint “Class Structure” → “No-op method in abstract class” and a class like this:

abstract class DocumentContentListener implements DocumentListener {

    @Override
    public final void changedUpdate(final DocumentEvent ignored) {
        // ignore
    }
}

I get a hint suggesting the no-op method should be made abstract. As the “final” modifier shows, the intention is to prevent subclasses to override this method. Therefore, the hint should not be displayed when the “final” modifier is present.

I reproduced this in 8.0.1 and Nightly (Build 201411120002 – without updates. After installing updates, I couldn’t open the file anymore, getting various exceptions in NetBeans.)