There used to be a rule, that complained about redundant interfaces. So, if my super class implements Closeable and my sub class does that, too, Sonar complains.
I can’t find that rule anymore. Maybe it got removed. If it still exists, it should be deactivated by default as well. The reason is, that the super class may not be under my control. And if I want to make sure, that my class implements Closeable, I should do that regardless of the super class already doing it.
Of course this rule is of very find use for on-demand “strict” or “info” scans.