No FindBugs warning for null return value if annotated with @Nonnull

Question

I have annotated a method returning null with the @javax.annotations.Nonnull annotation but FindBugs does not generate any warnings on this.

@Nonnull
public EventBuilder forCreateEvent() {
    return null;
}

Maybe I misunderstood the meaning of @Nonnull but I thought it means Method will not return null .

Additional comment: Please see my comment below for the cause of the problem.

Answer 1

The annotations that Findbugs understands are documented here .

At the time I originally answered this question, the javax.annotations.* annotations are not listed. They are listed now.

Answer 2

As assylias said, May be its conflicting. Try changing it to

@edu.umd.cs.findbugs.annotations.NonNull
public EventBuilder forCreateEvent() {
    return null;
}