Jackson: Ignore Json configuration value

Question

I have the following json file:

 {   "segments": {                     "externalId": 123,              "name": "Tomas Zulberti",              "shouldInform": true,              "id": 4    } } 

But the java model is as follows:

 public class Segment {      private String id;     private String name;     private boolean shouldInform;      // getter and setters here... } 

When Jackson is parsing it raises an exception becuase there is no getter or setter for the field "externalId". It there a decorator that can be used to ignore a json field?

Answer 1

You can use annotation @JsonIgnoreProperties; if it's just one value you want to skip, something like:

@JsonIgnoreProperties({"externalId"}) 

or to ignore anything that can't be used:

@JsonIgnoreProperties(ignoreUnknown=true) 

There are other ways to do it too, for rest check out FasterXML Jackson wiki.

Answer 2

Also we can use mapper.enable(DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES); instead @JsonIgnoreProperties(ignoreUnknown=true)

but for particular property we can use

@JsonIgnoreProperties({"externalId"}) public class Segment {      private String id;     private String name;     private boolean shouldInform;      // getter and setters here... }