src/main/java/org/apache/commons/collections4/bag/CollectionBag.java [161:172]:
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    public boolean removeAll(final Collection<?> coll) {
        if (coll != null) {
            boolean result = false;
            for (final Object obj : coll) {
                final boolean changed = remove(obj, getCount(obj));
                result = result || changed;
            }
            return result;
        }
        // let the decorated bag handle the case of null argument
        return decorated().removeAll(null);
    }
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src/main/java/org/apache/commons/collections4/bag/CollectionSortedBag.java [113:124]:
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    public boolean removeAll(final Collection<?> coll) {
        if (coll != null) {
            boolean result = false;
            for (final Object obj : coll) {
                final boolean changed = remove(obj, getCount(obj));
                result = result || changed;
            }
            return result;
        }
        // let the decorated bag handle the case of null argument
        return decorated().removeAll(null);
    }
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