How Can I Deserialize JSON into a Generic Class with Jackson?

Generic Class Deserialization with Jackson

When attempting to deserialize JSON data into a generic class like Data, the question arises as to how to specify the type parameter T. The typical approach of using mapper.readValue(jsonString, Data.class) only constructs an instance of Data, but the specific type of T remains unknown.

Solution

Jackson provides a solution through the TypeReference class. By creating a TypeReference object for the desired generic type and passing it to the readValue method, we can explicitly specify the type parameter.

mapper.readValue(jsonString, new TypeReference<data>>() {});</data>

In this example, a TypeReference is created for the generic class Data, ensuring that the deserialized object will be an instance of Data with T set to String.

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