java - class A declares multiple JSON fields

Question

i have a class A which has some private fields and the same class extends another class B which also has some private fields which are in class A.

public class A extends B {
    private BigDecimal netAmountTcy;
    private BigDecimal netAmountPcy;   
    private BigDecimal priceTo;  
    private String segment;

    private BigDecimal taxAmountTcy;
    private BigDecimal taxAmountPcy;   
    private BigDecimal tradeFeesTcy;
    private BigDecimal tradeFeesPcy;

// getter and setter for the above fields

}

and class B has got some private fiedls which are in class A

now when i try to create JSON string from above class A i get the following exception :

class com.hexgen.ro.request.A declares multiple JSON fields named netAmountPcy

How to fix this?

Since they are private fields there should not be any problem while creating json string i guess but i am not sure.

i create json string like the following :

Gson gson = new Gson();
 tempJSON = gson.toJson(obj);

here obj is the object of class A

Answer 1

Since they are private fields there should not be any problem while creating json string

I don't think this statement is true, GSON looks up at the object's private fields when serializing, meaning all private fields of superclass are included, and when you have fields with same name it throws an error.

If there's any particular field you don't want to include you have to mark it with transient keyword, eg:

private transient BigDecimal tradeFeesPcy;