dosubot[bot] commented on issue #2778: URL: https://github.com/apache/incubator-hugegraph/issues/2778#issuecomment-2918486400
<!-- Answer --> 你的 kneighbor 调用报错（`SerializeException: Failed to deserialize`）的根本原因，是 HugeGraph 返回的 kneighbor 结果中，`vertices` 字段是字符串数组（如 `"32:ad...@fakecompany.com"`），但 Java 客户端在反序列化时，期望的是 Vertex 对象，而不是字符串。这导致 Jackson 反序列化时找不到合适的构造方法，从而抛出异常。 根据 HugeGraph 的 [K-neighbor API 文档](https://github.com/apache/incubator-hugegraph-doc/blob/master/content/cn/docs/clients/restful-api/traverser.md)，kneighbor 的标准响应格式中，`vertices` 字段确实是字符串 ID 数组，而不是 Vertex 对象。这意味着当前 Java 客户端的反序列化逻辑和服务端返回的数据格式不匹配。 **解决思路：** 1. 检查你用的 HugeGraph Java Client 版本，确保它和服务端 1.5.0 版本兼容。如果客户端版本较老，可能不支持新格式。 2. 如果你只需要 ID，可以直接解析 kneighbor 返回的字符串 ID 数组，而不是 Vertex 对象。 3. 如果你需要完整 Vertex 信息，可以先拿到 ID，再用批量查询接口（如 `hugeClient.graph().getVertices(ids)`）获取详细信息。 4. 如果你有能力修改 Java Client，可以调整 kneighbor 相关的反序列化逻辑，把 `vertices` 字段映射为 `Set<String>` 或 `Set<Id>`，而不是 `Set<Vertex>`。 **参考：** - [K-neighbor API 响应格式](https://github.com/apache/incubator-hugegraph-doc/blob/master/content/cn/docs/clients/restful-api/traverser.md) - kneighbor 相关源码实现说明：[KneighborAPI](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-api/src/main/java/org/apache/hugegraph/api/traversers/KneighborAPI.java) 目前没有发现和你完全一样的历史 issue，但根据 API 文档和源码，服务端返回字符串 ID 是预期行为，建议优先排查客户端的反序列化逻辑。 <!-- Dosu Comment Footer --> *To reply, just mention my name [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? [Good](https://app.dosu.dev/response-feedback/b81f2a57-2b12-46d1-be8e-d65119f46dee?feedback_type=great_response) | [Irrelevant](https://app.dosu.dev/response-feedback/b81f2a57-2b12-46d1-be8e-d65119f46dee?feedback_type=irrelevant_answer) | [Incorrect](https://app.dosu.dev/response-feedback/b81f2a57-2b12-46d1-be8e-d65119f46dee?feedback_type=incorrect_sources) | [Verbose](https://app.dosu.dev/response-feedback/b81f2a57-2b12-46d1-be8e-d65119f46dee?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/b81f2a57-2b12-46d1-be8e-d65119f46dee?feedback_type=hallucination) | [Report 🐛](https://app.dosu.dev/response-feedback/b81f2a57-2b12-46d1-be8e-d65119f46dee?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/b81f2a57-2b12-46d1-be8e-d65119f46dee?feedback_type=other)</sup> [](https://go.dosu.dev/discord-bot) [! [Share on X](https://img.shields.io/badge/X-share-black)](https://twitter.com/intent/tweet?text=%40dosu_ai%20helped%20me%20solve%20this%20issue!&url=https%3A//github.com/apache/incubator-hugegraph/issues/2778) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@hugegraph.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@hugegraph.apache.org For additional commands, e-mail: issues-h...@hugegraph.apache.org
