DaTaobao Tech

Jun 24, 2022 · Backend Development

Random Fastjson Deserialization Failure Caused by Constructor Order

The article explains that Fastjson sometimes throws a syntax‑error exception when deserializing a JSON list of StewardTipCategory objects because the JVM returns overloaded constructors in nondeterministic order, causing Fastjson to pick the wrong constructor; removing or renaming the ambiguous constructor fixes the issue.