gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/JavaUtilSerializersV3.java [49:196]:
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    final static class MapJacksonSerializer extends StdSerializer<Map> {
        public MapJacksonSerializer() {
            super(Map.class);
        }

        @Override
        public void serialize(final Map map, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            for(Map.Entry entry : (Set<Map.Entry>) map.entrySet()) {
                jsonGenerator.writeObject(entry.getKey());
                jsonGenerator.writeObject(entry.getValue());
            }
        }

        @Override
        public void serializeWithType(final Map map, final JsonGenerator jsonGenerator,
                                      final SerializerProvider serializerProvider, final TypeSerializer typeSerializer) throws IOException {
            typeSerializer.writeTypePrefixForObject(map, jsonGenerator);
            serialize(map, jsonGenerator, serializerProvider);
            typeSerializer.writeTypeSuffixForObject(map, jsonGenerator);
        }
    }

    /**
     * Coerces {@code Map.Entry} to a {@code Map} with a single entry in it.
     */
    final static class MapEntryJacksonSerializer extends StdSerializer<Map.Entry> {

        public MapEntryJacksonSerializer() {
            super(Map.Entry.class);
        }

        @Override
        public void serialize(final Map.Entry entry, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            final Map<Object,Object> m = new HashMap<>();
            if (entry != null) m.put(entry.getKey(), entry.getValue());
            jsonGenerator.writeObject(m);
        }

        @Override
        public void serializeWithType(final Map.Entry entry, final JsonGenerator jsonGenerator,
                                      final SerializerProvider serializerProvider, final TypeSerializer typeSerializer) throws IOException {
            serialize(entry, jsonGenerator, serializerProvider);
        }
    }

    final static class SetJacksonSerializer extends StdSerializer<Set> {
        public SetJacksonSerializer() {
            super(Set.class);
        }

        @Override
        public void serialize(final Set set, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            for(Object o : set) {
                jsonGenerator.writeObject(o);
            }
        }

        @Override
        public void serializeWithType(final Set set, final JsonGenerator jsonGenerator,
                                      final SerializerProvider serializerProvider, final TypeSerializer typeSerializer) throws IOException {
            typeSerializer.writeTypePrefixForArray(set, jsonGenerator);
            serialize(set, jsonGenerator, serializerProvider);
            typeSerializer.writeTypeSuffixForArray(set, jsonGenerator);
        }
    }

    final static class ListJacksonSerializer extends StdSerializer<List> {
        public ListJacksonSerializer() {
            super(List.class);
        }

        @Override
        public void serialize(final List list, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            for(Object o : list) {
                jsonGenerator.writeObject(o);
            }
        }

        @Override
        public void serializeWithType(final List list, final JsonGenerator jsonGenerator,
                                      final SerializerProvider serializerProvider, final TypeSerializer typeSerializer) throws IOException {
            typeSerializer.writeTypePrefixForArray(list, jsonGenerator);
            serialize(list, jsonGenerator, serializerProvider);
            typeSerializer.writeTypeSuffixForArray(list, jsonGenerator);
        }
    }

    ////////////////////////////// DESERIALIZERS /////////////////////////////////


    static class MapJacksonDeserializer extends StdDeserializer<Map> {

        protected MapJacksonDeserializer() {
            super(Map.class);
        }

        @Override
        public Map deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final Map<Object,Object> m = new LinkedHashMap<>();

            while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
                final Object key = deserializationContext.readValue(jsonParser, Object.class);
                jsonParser.nextToken();
                final Object val = deserializationContext.readValue(jsonParser, Object.class);
                m.put(key, val);
            }

            return m;
        }
    }

    static class SetJacksonDeserializer extends StdDeserializer<Set> {

        protected SetJacksonDeserializer() {
            super(Set.class);
        }

        @Override
        public Set deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final Set<Object> s = new LinkedHashSet<>();

            while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
                s.add(deserializationContext.readValue(jsonParser, Object.class));
            }

            return s;
        }
    }

    static class ListJacksonDeserializer extends StdDeserializer<List> {

        protected ListJacksonDeserializer() {
            super(List.class);
        }

        @Override
        public List deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final List<Object> s = new LinkedList<>();

            while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
                s.add(deserializationContext.readValue(jsonParser, Object.class));
            }

            return s;
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/JavaUtilSerializersV4.java [49:196]:
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    final static class MapJacksonSerializer extends StdSerializer<Map> {
        public MapJacksonSerializer() {
            super(Map.class);
        }

        @Override
        public void serialize(final Map map, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            for(Map.Entry entry : (Set<Map.Entry>) map.entrySet()) {
                jsonGenerator.writeObject(entry.getKey());
                jsonGenerator.writeObject(entry.getValue());
            }
        }

        @Override
        public void serializeWithType(final Map map, final JsonGenerator jsonGenerator,
                                      final SerializerProvider serializerProvider, final TypeSerializer typeSerializer) throws IOException {
            typeSerializer.writeTypePrefixForObject(map, jsonGenerator);
            serialize(map, jsonGenerator, serializerProvider);
            typeSerializer.writeTypeSuffixForObject(map, jsonGenerator);
        }
    }

    /**
     * Coerces {@code Map.Entry} to a {@code Map} with a single entry in it.
     */
    final static class MapEntryJacksonSerializer extends StdSerializer<Map.Entry> {

        public MapEntryJacksonSerializer() {
            super(Map.Entry.class);
        }

        @Override
        public void serialize(final Map.Entry entry, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            final Map<Object,Object> m = new HashMap<>();
            if (entry != null) m.put(entry.getKey(), entry.getValue());
            jsonGenerator.writeObject(m);
        }

        @Override
        public void serializeWithType(final Map.Entry entry, final JsonGenerator jsonGenerator,
                                      final SerializerProvider serializerProvider, final TypeSerializer typeSerializer) throws IOException {
            serialize(entry, jsonGenerator, serializerProvider);
        }
    }

    final static class SetJacksonSerializer extends StdSerializer<Set> {
        public SetJacksonSerializer() {
            super(Set.class);
        }

        @Override
        public void serialize(final Set set, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            for(Object o : set) {
                jsonGenerator.writeObject(o);
            }
        }

        @Override
        public void serializeWithType(final Set set, final JsonGenerator jsonGenerator,
                                      final SerializerProvider serializerProvider, final TypeSerializer typeSerializer) throws IOException {
            typeSerializer.writeTypePrefixForArray(set, jsonGenerator);
            serialize(set, jsonGenerator, serializerProvider);
            typeSerializer.writeTypeSuffixForArray(set, jsonGenerator);
        }
    }

    final static class ListJacksonSerializer extends StdSerializer<List> {
        public ListJacksonSerializer() {
            super(List.class);
        }

        @Override
        public void serialize(final List list, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            for(Object o : list) {
                jsonGenerator.writeObject(o);
            }
        }

        @Override
        public void serializeWithType(final List list, final JsonGenerator jsonGenerator,
                                      final SerializerProvider serializerProvider, final TypeSerializer typeSerializer) throws IOException {
            typeSerializer.writeTypePrefixForArray(list, jsonGenerator);
            serialize(list, jsonGenerator, serializerProvider);
            typeSerializer.writeTypeSuffixForArray(list, jsonGenerator);
        }
    }

    ////////////////////////////// DESERIALIZERS /////////////////////////////////


    static class MapJacksonDeserializer extends StdDeserializer<Map> {

        protected MapJacksonDeserializer() {
            super(Map.class);
        }

        @Override
        public Map deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final Map<Object,Object> m = new LinkedHashMap<>();

            while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
                final Object key = deserializationContext.readValue(jsonParser, Object.class);
                jsonParser.nextToken();
                final Object val = deserializationContext.readValue(jsonParser, Object.class);
                m.put(key, val);
            }

            return m;
        }
    }

    static class SetJacksonDeserializer extends StdDeserializer<Set> {

        protected SetJacksonDeserializer() {
            super(Set.class);
        }

        @Override
        public Set deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final Set<Object> s = new LinkedHashSet<>();

            while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
                s.add(deserializationContext.readValue(jsonParser, Object.class));
            }

            return s;
        }
    }

    static class ListJacksonDeserializer extends StdDeserializer<List> {

        protected ListJacksonDeserializer() {
            super(List.class);
        }

        @Override
        public List deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final List<Object> s = new LinkedList<>();

            while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
                s.add(deserializationContext.readValue(jsonParser, Object.class));
            }

            return s;
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