45

Getting deprecated message for JsonParser for Spring Boot app,

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

What is the alternative?

Sazzad Hissain Khan
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  • If the JsonPraser used is [this](https://javadoc.io/doc/com.google.code.gson/gson/latest/com.google.gson/com/google/gson/JsonParser.html#%3Cinit%3E()) , then the message says _No need to instantiate this class, use the static methods instead._ – R.G Mar 20 '20 at 09:26
  • Also you may use correct static method based on the `parse()` param – R.G Mar 20 '20 at 09:29
  • I am using `com.google.code.gson:gson:2.8.6` – Sazzad Hissain Khan Mar 20 '20 at 09:34
  • No `parse()` method available for JsonParser class – Sazzad Hissain Khan Mar 20 '20 at 09:35
  • The code shared shows `parse(result)` method used, there are alternative static methods for the `result` type. What is the type of the `result` parameter ? String , Reader or JsonReader ? – R.G Mar 20 '20 at 09:37

1 Answers1

79

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));

    }
}
double-beep
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R.G
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