jackson parse json string to object

stackoverflow.com › questions › 21640318 › json-string-to-java-object-with-jackson

Try this,

You can't create a new string like your doing.

    String string = "{\"id\":100,\"firstName\":\"Adam\"}";
    Student student = mapper.readValue(string, Student.class);

Answer from Dan Ciborowski - MSFT on Stack Overflow

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Intro to the Jackson ObjectMapper | Baeldung

December 9, 2025 - We can use it to parse or deserialize JSON content into a Java object. Also, on the writing side, we can use the writeValue API to serialize any Java object as JSON output. We’ll use the following Car class with two fields as the object to serialize or deserialize throughout this article: public class Car { private String color; private String type; // standard getters setters }

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stackoverflow.com › questions › 21640318 › json-string-to-java-object-with-jackson

JSON string to Java object with Jackson - Stack Overflow

Top answer

1 of 2

Try this,

You can't create a new string like your doing.

    String string = "{\"id\":100,\"firstName\":\"Adam\"}";
    Student student = mapper.readValue(string, Student.class);

2 of 2

And instead of handling errors in every mapper.readValue(json, Class) you can write a helper class which has another Generic method.

and use

String jsonString = "{\"id\":100,\"firstName\":\"Adam\"}";
Student student = JSONUtils.convertToObject(jsonString, Student.class);

I'm returning null and fancying printing trace & checking null later on. You can handle error cases on your own way.

public class JSONUtils {
    public static String convertToJSON(Object object) {
        ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter();
        String json;
        try {
            json = ow.writeValueAsString(object);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
            return convertToJSON(e);
        }
        return json;
    }
    
    
    public static <T> T convertToObject(Class<T> clazz, String jsonString) {
        try {
            ObjectMapper mapper = new ObjectMapper();
            return (T) mapper.readValue(jsonString, clazz);
        } catch(Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

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