ImmutableCollections — 2 Technical Articles

Sep 8, 2025 · Backend Development

Why HSF’s Hessian2 Serialization Fails with Java 9 Immutable Collections

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.

HSFImmutableCollectionsJava9

0 likes · 25 min read

Why HSF’s Hessian2 Serialization Fails with Java 9 Immutable Collections

DaTaobao Tech

Aug 29, 2025 · Backend Development

Why HSF’s Hessian2 Serialization Fails with Java 9 Immutable Collections (Set.of)

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.

HSFImmutableCollectionsJava

0 likes · 24 min read

Why HSF’s Hessian2 Serialization Fails with Java 9 Immutable Collections (Set.of)

Why HSF’s Hessian2 Serialization Fails with Java 9 Immutable Collections

Why HSF’s Hessian2 Serialization Fails with Java 9 Immutable Collections (Set.of)

Why HSF’s Hessian2 Serialization Fails with Java 9 Immutable Collections (Set.of)