How to Deserialize JSON into Generic Types with Jackson?

Generic Deserialization with Jackson

When deserializing JSON data into a generic class like Data, it's often necessary to specify the type of the generic parameter T. The standard approach using mapper.readValue(jsonString, Data.class) doesn't provide this information.

To address this, Jackson relies on the TypeReference object. By creating a TypeReference specifically for the desired generic type, you can guide the deserialization process.

To deserialize a JSON string into an instance of Data, instantiate a TypeReference using anonymous inner class syntax:

TypeReference<Data<String>> typeRef = new TypeReference<Data<String>>() {};

Then, pass the TypeReference as the second argument to the readValue method:

Data<String> data = mapper.readValue(jsonString, typeRef);

This approach ensures that Jackson knows the specific type of T to deserialize into, resulting in correct deserialization behavior.

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