consider this code:

class ConstantIterator<T> implements Iterator<T> {
    private final T value;

    private ConstantIterator(T value) {
        this.value = value;
    }

    @Override
    public boolean hasNext() {
        return true;
    }

    @Override
    public T next() {
        return value;
    }
}

This is a fine iterator. However, spotbugs reports

[ERROR] Medium: ConstantIterator.next() cannot throw NoSuchElementException [ConstantIterator] At ConstantIterator.java:[line 17] IT_NO_SUCH_ELEMENT

throwing "NoSuchElementException" is a strictly optional operation in an iterator (the javadoc state "NoSuchElementException - if the iteration has no more elements". This iteration always has more elements.

Spotbugs should not report an error here.