Jackson object mapper not creating proper Json string from java object

Question

I don't have A, B, C in key I have key like user_id, password etc. Also if I print toString of User class it display correct content.

Note : User object is coming form sqlite database and I double check it's working perfectly.

Please check attach User class also. I used this class to save sqlite values.

So I am getting user data from sqlite in the form of user object then converting user object into jsonstring using Jackson object mapper.

It would be great help if you point out what's wrong.

Currently I am getting below jsnstring which is wrong.

 

    {"A":1,"B":1,"C":1,"D":1,"E":1,"F":1,"G":0,"H":"ef","I":"","J":0,"K":30,"L":"","M":1,"N":0,"O":1,"P":0,"Q":"","R":"","S":1,"T":"","U":1,"V":"fkGinMCh02k:APA91bH1I8Hv1EIGdkRtZiqjvsMY-ixk_crcNxSQ3gQ1PuAOoQ0B4qllstCdOw43nZQ90JiqTpcfCyQ-_y6RsxnWcjg0gojqZ8pv4Fia_9mW4-De7nPQF4C5XIF16V5","W":"","X":0,"Y":"1","Z":"1,2,3,4,5,6,7,9,16","a":91316,"b":"[email protected]","c":"","d":"im","e":"F","f":"","g":1,"h":1,"i":1,"j":2478,"k":492372,"l":0,"m":10,"n":0,"o":"","p":0,"q":0,"r":0,"s":91316,"t":1,"u":1,"v":1,"w":1,"x":1,"y":0,"z":0}

Expected jsonstring

{"user_id":1,"first_name":"test","last_name":"test"}

I am getting abcd "key" in jsonstring instead of actual key while I am converting from java object.

My actual key are like user_id , email etc.

private String getUserObjectString() {
        String jsonStr = "";
        User user = here I am getting actual object content;
        ObjectMapper mapper = new ObjectMapper();
        try {
             jsonStr = mapper.writeValueAsString(user);
        } catch (JsonProcessingException e) {
            Log.i("Exception","1");
            e.printStackTrace();
        }
        return jsonStr;
    }

---

public class User {

    public int userid;
    public String email;
    public String updatedemail;
    public String firstname;
    public String lastname;
    // Empty constructor
    public User() {

    }

    // constructor
    public User(int userid, String email, String updatedemail, String firstname, String lastname){
     this.userid = userid;
        this.email = email;
        this.updatedemail = updatedemail;
        this.firstname = firstname;
        this.lastname = lastname;
    }
    public int getID() {
        return this.userid;
    }

    public void setID(int userid) {
        this.userid = userid;
    }

    public String getemail() {
        return this.email;
    }

    public String getfirstname() {
        return this.firstname;
    }

    public String getlastname() {
        return this.lastname;
    }
    public void setFirstName(String firstname) {
        this.firstname = firstname;
    }

    public void setLastName(String lastname) {
        this.lastname = lastname;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getNewemail() {
     return this.updatedemail;
    }

    public void setNewemail(String newemail) {
     this.updatedemail = newemail;
    }

@Override
    public String toString() {
        return "User{" +
                "userid=" + userid +
                ", email='" + email + '\'' +
                ", updatedemail='" + updatedemail + '\'' +
                ", firstname='" + firstname + '\'' +
                ", lastname='" + lastname + '\'' +
    '}';
    }
}

This is the output of toString()

User{userid=9116, email='[email protected]', updatedemail='', firstname='Test', lastname='Flutter2'}