如何序列化rest服务的Tinkerpop顶点/边列表?[嵌入式JanusGraph]

使用嵌入式JanusGraph,我创建了一个REST服务,它返回顶点和边的列表,但我希望返回json,就像gremlin服务器一样。

我尝试使用MessageSerializer,但无法将二进制格式强制转换为json。

@RequestMapping("/search")
public String search(@RequestBody SearchOptions options) throws JsonProcessingException, SerializationException {
    List<Object> data = new ArrayList<>();
    Builder responseBuilder = getResponseBuilder(data);

    List<Vertex> nodes;
    List<Object> edges;

    if (Strings.isNullOrEmpty(options.getText()) || Strings.isNullOrEmpty(options.getField())) {
        nodes = g.V().limit(options.getLimit()).toList();
        edges = g.V().limit(options.getLimit()).aggregate("node").outE().as("edge").inV().where(P.within("node"))
                .select("edge").toList();
    } else {
        nodes = g.V().has(options.getField(), options.getText()).toList();
        edges = g.V().has(options.getField(), options.getText()).aggregate("node").outE().as("edge").inV()
                .where(P.within("node")).select("edge").toList();
    }
    data.add(nodes);
    data.add(edges);

    ResponseMessage response = responseBuilder.create();
    ByteBufAllocator allocator = new PooledByteBufAllocator();
    ByteBuf byteBuffer = ser.serializeResponseAsBinary(response, allocator);
    byte[] bytes = byteBuffer.array();
    String str = new String(bytes);
    return str;
}   

@Bean
public MessageSerializer messageSerializer() {
    GryoMapper.Builder kryo = GryoMapper.build().addRegistry(JanusGraphIoRegistry.getInstance());
    MessageSerializer serializer = new GryoMessageSerializerV1d0(kryo);
    return serializer;
}

我尝试使用jackson对象映射器,但出现以下错误-

[http-nio-8080-exec-10] ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception
org.apache.tinkerpop.shaded.jackson.databind.JsonMappingException: (was java.lang.IllegalStateException) (through reference chain: org.apache.tinkerpop.gremlin.driver.message.ResponseMessage["result"]->org.apache.tinkerpop.gremlin.driver.message.ResponseResult["data"]->java.util.ArrayList[0]->java.util.ArrayList[0]->org.janusgraph.graphdb.relations.RelationIdentifier["inVertexId"])
    at org.apache.tinkerpop.shaded.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:388)   

我这样定义ObjectMapper-

ObjectMapper mapper = GraphSONMapper.build().version(GraphSONVersion.V2_0).create().createMapper();

仅供参考-这是创建ObjectMapper的正确方法。

private ObjectMapper mapper = GraphSONMapper.build()
        .addRegistry(JanusGraphIoRegistry.getInstance())
        .version(GraphSONVersion.V2_0).create().createMapper();