Web Reference: Apr 8, 2024 · This exception is thrown if Jackson can’t create an instance of the class, which happens if the class is abstract or it is just an interface. Here we’ll try to deserialize an instance from class Zoo that has a property animal with abstract type Animal: Jul 12, 2014 · You can only deserialize an array of JSON objects into an array or collection of POJO's. Note that, whereas a JSON object is delimited by { } braces, an array is delimited by [ ] brackets, with some number of objects inside of it. Jan 16, 2026 · When it encounters a JSON array ([ ... ], denoted by the START_ARRAY token) where it expects a String, this error occurs. In this guide, we’ll demystify this error, explore its root causes, and walk through actionable solutions to fix it.
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