CODEWITHSUNDEEP
javajsongson
I wrestled a bear once.
I wrestled a bear once.

Reputation: 23379

Parsing JSON - Can't get boolean value from JsonObject

I've been trying to figure out how to do some basic stuff in Java..

I've got a request being made to an API, which returns the following JSON.

{"success": false, "message": "some string", "data": []}

This is represented by the String result in the following:

JsonObject root = new JsonParser().parse(result).getAsJsonObject();
success = root.getAsJsonObject("success").getAsBoolean();

I need to get the "success" parameter as a boolean. Getting an error on the getAsBoolean() call.

java.lang.ClassCastException: com.google.gson.JsonPrimitive cannot be cast to com.google.gson.JsonObject

What am I doing wrong? How do I get the bool value of "success"?

Upvotes: 4

Views: 26391

Answers (4)

zardilior
zardilior

Reputation: 2978

If root is a jsonObject

root.getBoolean("success");

Upvotes: 1

ikryvorotenko
ikryvorotenko

Reputation: 1423

you're calling root.getAsJsonObject("success") while the success is a boolean value itself, not an object.

Try following

JsonObject root = new JsonParser().parse(result).getAsJsonObject();
success = root.get("success").getAsBoolean();

Upvotes: 2

ΦXocę 웃 Пepeúpa ツ
ΦXocę 웃 Пepeúpa ツ

Reputation: 48287

The reason that is breaking your code is that you are calling the wrong method...

Do

success = root.get("success").getAsBoolean();

instead of 

success = root.getAsJsonObject("success").getAsBoolean();

Example:

public static void main(String[] args) {
    String result = "{\"success\": false, \"message\": \"some string\", \"data\": []}";
    JsonObject root = new JsonParser().parse(result).getAsJsonObject();
    boolean success = root.get("success").getAsBoolean();
    }

Upvotes: 10

Dalton D
Dalton D

Reputation: 111

I would just use the root.get("success") method. Success isn't really a json object, it's a member of a json object. See here https://google.github.io/gson/apidocs/com/google/gson/JsonObject.html#get-java.lang.String-

Upvotes: 1

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