gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/TraversalSerializersV2.java [148:210]:
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    final static class TraverserJacksonSerializer extends StdScalarSerializer<Traverser> {

        public TraverserJacksonSerializer() {
            super(Traverser.class);
        }

        @Override
        public void serialize(final Traverser traverserInstance, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeStartObject();
            jsonGenerator.writeObjectField(GraphSONTokens.BULK, traverserInstance.bulk());
            jsonGenerator.writeObjectField(GraphSONTokens.VALUE, traverserInstance.get());
            jsonGenerator.writeEndObject();
        }
    }

    final static class TraversalStrategyJacksonSerializer extends StdScalarSerializer<TraversalStrategy> {

        public TraversalStrategyJacksonSerializer() {
            super(TraversalStrategy.class);
        }

        @Override
        public void serialize(final TraversalStrategy traversalStrategy, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeStartObject();
            final String fqcn = traversalStrategy instanceof TraversalStrategyProxy ?
                    ((TraversalStrategyProxy) traversalStrategy).getStrategyClass().getName() :
                    traversalStrategy.getClass().getName();
            jsonGenerator.writeStringField("fqcn", fqcn);
            jsonGenerator.writeObjectFieldStart("conf");
            for (final Map.Entry<Object, Object> entry : ConfigurationConverter.getMap(traversalStrategy.getConfiguration()).entrySet()) {
                jsonGenerator.writeObjectField((String) entry.getKey(), entry.getValue());
            }
            jsonGenerator.writeEndObject();
            jsonGenerator.writeEndObject();
        }
    }

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

    final static class EnumJacksonDeserializer<A extends Enum> extends StdDeserializer<A> {

        public EnumJacksonDeserializer(final Class<A> enumClass) {
            super(enumClass);
        }

        @Override
        public A deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final Class<A> enumClass = (Class<A>) this._valueClass;
            final String enumName = jsonParser.getText();
            for (final Enum a : enumClass.getEnumConstants()) {
                if (a.name().equals(enumName))
                    return (A) a;
            }
            throw new IOException("Unknown enum type: " + enumClass);
        }

        @Override
        public boolean isCachable() {
            return true;
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/TraversalSerializersV3.java [164:226]:
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    final static class TraverserJacksonSerializer extends StdScalarSerializer<Traverser> {

        public TraverserJacksonSerializer() {
            super(Traverser.class);
        }

        @Override
        public void serialize(final Traverser traverserInstance, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeStartObject();
            jsonGenerator.writeObjectField(GraphSONTokens.BULK, traverserInstance.bulk());
            jsonGenerator.writeObjectField(GraphSONTokens.VALUE, traverserInstance.get());
            jsonGenerator.writeEndObject();
        }
    }

    final static class TraversalStrategyJacksonSerializer extends StdScalarSerializer<TraversalStrategy> {

        public TraversalStrategyJacksonSerializer() {
            super(TraversalStrategy.class);
        }

        @Override
        public void serialize(final TraversalStrategy traversalStrategy, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeStartObject();
            final String fqcn = traversalStrategy instanceof TraversalStrategyProxy ?
                    ((TraversalStrategyProxy) traversalStrategy).getStrategyClass().getName() :
                    traversalStrategy.getClass().getName();
            jsonGenerator.writeStringField("fqcn", fqcn);
            jsonGenerator.writeObjectFieldStart("conf");
            for (final Map.Entry<Object, Object> entry : ConfigurationConverter.getMap(traversalStrategy.getConfiguration()).entrySet()) {
                jsonGenerator.writeObjectField((String) entry.getKey(), entry.getValue());
            }
            jsonGenerator.writeEndObject();
            jsonGenerator.writeEndObject();
        }
    }

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

    final static class EnumJacksonDeserializer<A extends Enum> extends StdDeserializer<A> {

        public EnumJacksonDeserializer(final Class<A> enumClass) {
            super(enumClass);
        }

        @Override
        public A deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final Class<A> enumClass = (Class<A>) this._valueClass;
            final String enumName = jsonParser.getText();
            for (final Enum a : enumClass.getEnumConstants()) {
                if (a.name().equals(enumName))
                    return (A) a;
            }
            throw new IOException("Unknown enum type: " + enumClass);
        }

        @Override
        public boolean isCachable() {
            return true;
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