Java Can Not Deserialize Instance 3ONGz ESWlg - Complete Information & Details

Web Reference: 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. In this short tutorial, we’ll shed light on how to fix the exception JsonMappingException: Can not deserialize instance of java.util.ArrayList from Object value (token `JsonToken.START_OBJECT`). First, we’ll highlight the main cause of the exception. Then we’ll demonstrate how to reproduce it in practice, and finally, how to solve it. Jan 16, 2026 · We’ll explore two primary solutions to resolve this error: 1. Global Configuration. Enable Jackson’s ACCEPT_SINGLE_VALUE_AS_ARRAY feature to globally allow single values to be deserialized as arrays/lists. This works for all List fields in your application. 2. Per-Field Customization.

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