Mapping JSON into POJO using Gson

Question

I have the following JSON to represent the server response for a salt request:

{ "USER": { "E_MAIL":"email", "SALT":"salt" }, "CODE":"010" }

And i tried to map it with the following POJO:

public class SaltPOJO { private String code = null; private User user = null; @Override public String toString() { return this.user.toString(); } public String getCode() { return code; } public void setCode(String code) { this.code = code; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } public class User { private String e_mail = null; private String salt = null; @Override public String toString() { return this.e_mail + ": " + this.salt; } public String getE_mail() { return e_mail; } public void setE_mail(String e_mail) { this.e_mail = e_mail; } public String getSalt() { return salt; } public void setSalt(String salt) { this.salt = salt; } } }

Now everytime i do this:

Gson gson = new Gson(); SaltPOJO saltPojo = gson.fromJson(json.toString(), SaltPOJO.class); Log.v("Bla", saltPojo.toString());

The saltPojo.toString() is null. How can i map my JSON into POJO using Gson? Is the order of my variables important for the Gson mapping?

The order of fields doesn't matter, but names yes, you probably should take a look at the user guide — user180100
– user180100, Commented Nov 20, 2014 at 12:22

Braj · Accepted Answer · 2014-11-20 13:23:04Z

Is the order of my variables important for the Gson mapping?

No, that's not the case.

How can i map my JSON into POJO using Gson?

It's Case Sensitive and the keys in JSON string should be same as variable names used in POJO class.

You can use @SerializedName annotation to use any variable name as your like.

Sample code:

 class SaltPOJO { @SerializedName("CODE") private String code = null; @SerializedName("USER") private User user = null; ... class User { @SerializedName("E_MAIL") private String e_mail = null; @SerializedName("SALT") private String salt = null;

SMA · Accepted Answer · 2014-11-20 12:31:45Z

You don't have proper mapping between your getter and setter. If you change your json to something like below, it would work:

{ "user": { "email":"email", "salt":"salt" }, "code":"010" }

If you are getting json form third party then unfortunately, you would have to change your pojo or you could use adapter.

so it is case sensitive? that would be very bad because i cant change the json. the json is fix.

Collectives™ on Stack Overflow

Mapping JSON into POJO using Gson

2 Answers 2

Comments

2 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Linked

Related