JsonParser is deprecated

Question

Getting deprecated message for JsonParser for Spring Boot app,

JsonObject jsonObject = new JsonParser().parse(result).getAsJsonObject();

What is the alternative?

Answer 1

Based on the javadoc for Gson 2.8.6

No need to instantiate this class, use the static methods instead.

and following are the alternatives to be used.

// jsonString is of type java.lang.String
JsonObject jsonObject = JsonParser.parseString​(jsonString).getAsJsonObject();

// reader is of type java.io.Reader
JsonObject jsonObject = JsonParser.parseReader​(reader).getAsJsonObject();

// jsonReader is of type com.google.gson.stream.JsonReader
JsonObject jsonObject = JsonParser.parseReader​(jsonReader).getAsJsonObject();

Example

import static org.junit.Assert.assertTrue;

import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class Test {

    public static void main(String[] args) {
        String jsonString = "{ \"name\":\"John\"}";

        JsonObject jsonObjectAlt = JsonParser.parseString(jsonString).getAsJsonObject();
        // Shows deprecated warning for new JsonParser() and parse(jsonString)
        JsonObject jsonObject = new JsonParser().parse(jsonString).getAsJsonObject();

        assertTrue(jsonObjectAlt.equals(jsonObject));

    }
}

Answer 2

new GsonBuilder().setPrettyPrinting().create().toJson(new JSONParser(jsonString).parse());