gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/TraversalSerializersV2.java [68:159]:
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    final static class TraversalJacksonSerializer extends StdSerializer<Traversal> {

        public TraversalJacksonSerializer() {
            super(Traversal.class);
        }

        @Override
        public void serialize(final Traversal traversal, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeObject(traversal.asAdmin().getBytecode());
        }

        @Override
        public void serializeWithType(final Traversal traversal, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider, final TypeSerializer typeSerializer)
                throws IOException {
            serialize(traversal, jsonGenerator, serializerProvider);
        }

    }

    final static class BytecodeJacksonSerializer extends StdScalarSerializer<Bytecode> {

        public BytecodeJacksonSerializer() {
            super(Bytecode.class);
        }

        @Override
        public void serialize(final Bytecode bytecode, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeStartObject();
            if (bytecode.getSourceInstructions().iterator().hasNext()) {
                jsonGenerator.writeArrayFieldStart(GraphSONTokens.SOURCE);
                for (final Bytecode.Instruction instruction : bytecode.getSourceInstructions()) {
                    jsonGenerator.writeStartArray();
                    jsonGenerator.writeString(instruction.getOperator());
                    for (final Object argument : instruction.getArguments()) {
                        jsonGenerator.writeObject(argument);
                    }
                    jsonGenerator.writeEndArray();
                }
                jsonGenerator.writeEndArray();
            }
            if (bytecode.getStepInstructions().iterator().hasNext()) {
                jsonGenerator.writeArrayFieldStart(GraphSONTokens.STEP);
                for (final Bytecode.Instruction instruction : bytecode.getStepInstructions()) {
                    jsonGenerator.writeStartArray();
                    jsonGenerator.writeString(instruction.getOperator());
                    for (final Object argument : instruction.getArguments()) {
                        jsonGenerator.writeObject(argument);
                    }
                    jsonGenerator.writeEndArray();
                }
                jsonGenerator.writeEndArray();
            }

            jsonGenerator.writeEndObject();
        }
    }

    static class EnumJacksonSerializer extends StdScalarSerializer<Enum> {

        public EnumJacksonSerializer() {
            super(Enum.class);
        }

        @Override
        public void serialize(final Enum enumInstance, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeString(enumInstance.name());
        }

    }

    final static class PJacksonSerializer extends StdScalarSerializer<P> {

        public PJacksonSerializer() {
            super(P.class);
        }

        @Override
        public void serialize(final P p, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeStartObject();
            jsonGenerator.writeStringField(GraphSONTokens.PREDICATE, p.getPredicateName());
            if (p instanceof ConnectiveP) {
                jsonGenerator.writeArrayFieldStart(GraphSONTokens.VALUE);
                for (final P<?> predicate : ((ConnectiveP<?>) p).getPredicates()) {
                    jsonGenerator.writeObject(predicate);
                }
                jsonGenerator.writeEndArray();
            } else if (p instanceof NotP) {
                jsonGenerator.writeObjectField(GraphSONTokens.VALUE, p.negate());
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/TraversalSerializersV3.java [75:166]:
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    final static class TraversalJacksonSerializer extends StdSerializer<Traversal> {

        public TraversalJacksonSerializer() {
            super(Traversal.class);
        }

        @Override
        public void serialize(final Traversal traversal, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeObject(traversal.asAdmin().getBytecode());
        }

        @Override
        public void serializeWithType(final Traversal traversal, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider, final TypeSerializer typeSerializer)
                throws IOException {
            serialize(traversal, jsonGenerator, serializerProvider);
        }

    }

    final static class BytecodeJacksonSerializer extends StdScalarSerializer<Bytecode> {

        public BytecodeJacksonSerializer() {
            super(Bytecode.class);
        }

        @Override
        public void serialize(final Bytecode bytecode, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeStartObject();
            if (bytecode.getSourceInstructions().iterator().hasNext()) {
                jsonGenerator.writeArrayFieldStart(GraphSONTokens.SOURCE);
                for (final Bytecode.Instruction instruction : bytecode.getSourceInstructions()) {
                    jsonGenerator.writeStartArray();
                    jsonGenerator.writeString(instruction.getOperator());
                    for (final Object argument : instruction.getArguments()) {
                        jsonGenerator.writeObject(argument);
                    }
                    jsonGenerator.writeEndArray();
                }
                jsonGenerator.writeEndArray();
            }
            if (bytecode.getStepInstructions().iterator().hasNext()) {
                jsonGenerator.writeArrayFieldStart(GraphSONTokens.STEP);
                for (final Bytecode.Instruction instruction : bytecode.getStepInstructions()) {
                    jsonGenerator.writeStartArray();
                    jsonGenerator.writeString(instruction.getOperator());
                    for (final Object argument : instruction.getArguments()) {
                        jsonGenerator.writeObject(argument);
                    }
                    jsonGenerator.writeEndArray();
                }
                jsonGenerator.writeEndArray();
            }

            jsonGenerator.writeEndObject();
        }
    }

    static class EnumJacksonSerializer extends StdScalarSerializer<Enum> {

        public EnumJacksonSerializer() {
            super(Enum.class);
        }

        @Override
        public void serialize(final Enum enumInstance, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeString(enumInstance.name());
        }

    }

    final static class PJacksonSerializer extends StdScalarSerializer<P> {

        public PJacksonSerializer() {
            super(P.class);
        }

        @Override
        public void serialize(final P p, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            jsonGenerator.writeStartObject();
            jsonGenerator.writeStringField(GraphSONTokens.PREDICATE, p.getPredicateName());
            if (p instanceof ConnectiveP) {
                jsonGenerator.writeArrayFieldStart(GraphSONTokens.VALUE);
                for (final P<?> predicate : ((ConnectiveP<?>) p).getPredicates()) {
                    jsonGenerator.writeObject(predicate);
                }
                jsonGenerator.writeEndArray();
            } else if (p instanceof NotP) {
                jsonGenerator.writeObjectField(GraphSONTokens.VALUE, p.negate());
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