src/main/java/org/apache/commons/collections4/bidimap/AbstractDualBidiMap.java [767:794]:
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        @Override
        public K getKey() {
            if (last == null) {
                throw new IllegalStateException(
                        "Iterator getKey() can only be called after next() and before remove()");
            }
            return last.getKey();
        }

        @Override
        public V getValue() {
            if (last == null) {
                throw new IllegalStateException(
                        "Iterator getValue() can only be called after next() and before remove()");
            }
            return last.getValue();
        }

        @Override
        public V setValue(final V value) {
            if (last == null) {
                throw new IllegalStateException(
                        "Iterator setValue() can only be called after next() and before remove()");
            }
            if (parent.reverseMap.containsKey(value) &&
                parent.reverseMap.get(value) != last.getKey()) {
                throw new IllegalArgumentException(
                        "Cannot use setValue() when the object being set is already in the map");
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src/main/java/org/apache/commons/collections4/bidimap/DualTreeBidiMap.java [346:373]:
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        @Override
        public K getKey() {
            if (last == null) {
                throw new IllegalStateException(
                        "Iterator getKey() can only be called after next() and before remove()");
            }
            return last.getKey();
        }

        @Override
        public V getValue() {
            if (last == null) {
                throw new IllegalStateException(
                        "Iterator getValue() can only be called after next() and before remove()");
            }
            return last.getValue();
        }

        @Override
        public V setValue(final V value) {
            if (last == null) {
                throw new IllegalStateException(
                        "Iterator setValue() can only be called after next() and before remove()");
            }
            if (parent.reverseMap.containsKey(value) &&
                parent.reverseMap.get(value) != last.getKey()) {
                throw new IllegalArgumentException(
                        "Cannot use setValue() when the object being set is already in the map");
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