How to map a nested value to a property using Jackson annotations?

Question

Let's say I'm making a call to an API that responds with the following JSON for a product:

{   "id": 123,   "name": "The Best Product",   "brand": {      "id": 234,      "name": "ACME Products"   } } 

I'm able to map the product id and name just fine using Jackson annotations:

public class ProductTest {     private int productId;     private String productName, brandName;      @JsonProperty("id")     public int getProductId() {         return productId;     }      public void setProductId(int productId) {         this.productId = productId;     }      @JsonProperty("name")     public String getProductName() {         return productName;     }      public void setProductName(String productName) {         this.productName = productName;     }      public String getBrandName() {         return brandName;     }      public void setBrandName(String brandName) {         this.brandName = brandName;     } } 

And then using the fromJson method to create the product:

  JsonNode apiResponse = api.getResponse();   Product product = Json.fromJson(apiResponse, Product.class); 

But now I'm trying to figure out how to grab the brand name, which is a nested property. I was hoping that something like this would work:

    @JsonProperty("brand.name")     public String getBrandName() {         return brandName;     } 

But of course it didn't. Is there an easy way to accomplish what I want using annotations?

The actual JSON response I'm trying to parse is very complex, and I don't want to have to create an entire new class for every sub-node, even though I only need a single field.

Answer 1

You can achieve this like that:

String brandName;  @JsonProperty("brand") private void unpackNameFromNestedObject(Map<String, String> brand) {     brandName = brand.get("name"); }