JsonPointer example

JacksonPointerTest.java

package com.legbehindneck;

import java.io.IOException;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.core.JsonPointer;

public class Main {
    public static void main(String[] args) {

        ObjectMapper mapper = new ObjectMapper();

        String json = "{\"name\":{\"first\":\"John\",\"last\":\"Doe\"},\"age\":30,\"city\":\"New York\"}";

        JsonNode node = null;
        try {
            node = mapper.readTree(json);
          
            JsonPointer pointer = JsonPointer.compile("/name/first");
            JsonNode firstNameNode = node.at(pointer);

            System.out.println("First Name: " + firstNameNode.asText());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}