Does Jackson serialize getter property for an undefined field?-CodePudding

I have a class with the following fields and their respective getters, plus an additional method getTotalBalance for which I don't have any field but a custom implementation.

    public class demo{
    private String balance;
    private String blockedBalace;
    private String futureBalance;
    private String availableBalance;
    //getters for previous fields
    public String getTotalBalance(){
    //something..
    }

When I serialize an object of this class I get the following JSON output.

     {
      "balance": "12.30",
      "blockedBalance":"23.45",
      "futureBalance" :"56.22",
      "availableBalance" :"12.30",
      "totalBalance" : "34.11"
     }

Even if I didn't declare a field for totalBalance, I've got this serialized in the end. How is it possible?

CodePudding user response：

Jackson by default uses the getters for serializing and setters for deserializing.

You can use @JsonIgnore over your getter method to ignore it, OR you can configure your object mapper to use the fields only for serialization/des:

ObjectMapper objectMapper = new ObjectMapper();

objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE);
objectMapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);

CodePudding user response：

Jackson doesn't (by default) care about fields. It will simply serialize everything provided by getters and deserialize everything with a matching setter. What those getters/setters do is of no consequence.

Mind you though, that every little thing about Jackson can be deeply customized and configured, so I'm only talking about the default setup.