看起来你好像是尝试从JSON中读取实际描述数组的对象。 Java对象使用大括号 {} 映射到JSON对象，但是您的JSON实际上以方括号 [] 开头指定数组。

It looks like you are trying to read an object from JSON that actually describes an array. Java objects are mapped to JSON objects with curly braces {} but your JSON actually starts with square brackets [] designating an array.

实际拥有的是 List< product> 描述泛型类型，因为Java的类型擦除，您必须使用 TypeReference 。您的反序列化可以是： myProduct = objectMapper.readValue（productJson，new TypeReference< List< product>>（）{}）;

What you actually have is a List<product> To describe generic types, due to Java's type erasure, you must use a TypeReference. Your deserialization could read: myProduct = objectMapper.readValue(productJson, new TypeReference<List<product>>() {});

其他一些注释：你的课程应该始终是CamelCased。你的main方法可以只是 public static void main（String [] args）抛出异常这可以节省你所有无用的 catch 块。

A couple of other notes: your classes should always be CamelCased. Your main method can just be public static void main(String[] args) throws Exception which saves you all the useless catch blocks.