The article explains that HSF’s default Hessian2 serializer cannot handle Java 9 immutable collections like Set.of() because it only serializes the writeReplace proxy object and skips the actual elements, leading to a null‑array InvalidObjectException during deserialization.
When an HSF service receives a parameter created with Java 9's immutable collection factories such as Set.of(), the default Hessian2 serializer drops the collection elements, causing a NullArray InvalidObjectException and resulting in a SERVER_SERIALIZE_ERROR on the server side, which can be avoided by using mutable collections or a compatible serializer.
The dubbo-go v1.5.6 release aligns with Dubbo 2.7.8 and introduces a CLI tool, proxy extensions, configurable file paths, custom ConfigPostProcessor, URL comparison enhancements, registration center optimizations, API‑based config, gRPC tweaks, and updates to dubbo-go‑hessian2, with a roadmap toward cloud‑native 3.x.
This article walks through Dubbo’s RPC encoding and decoding mechanisms, explaining how Netty pipelines add codec handlers, detailing the message header format, exploring Hessian2 serialization, and answering common pitfalls such as class‑path changes and field mismatches.
An in‑depth analysis reveals how replacing Fastjson with Gson caused a 400 MB payload and OOM in production, comparing serialization size, reference handling, and throughput across Gson, Fastjson, Java native serialization, and Hessian2, and offering recommendations for choosing the right framework.
This article explains Dubbo’s network transport architecture, the Dubbo protocol with Hessian2 serialization, details the encoding/decoding process using Netty, and proposes optimization techniques such as reducing array copies, leveraging Netty 4 decoders, compressing binary data, and adopting alternative high‑performance serialization formats.
