Object Serialization with JSON

import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.*;
import java.util.List;
import java.util.Map;

public class ObjectSerialization {

    @JsonIgnoreProperties(ignoreUnknown = true)
    static class Configuration {
        @JsonProperty("app_name")
        private String appName;

        @JsonProperty("max_connections")
        private int maxConnections;

        @JsonProperty("features")
        private List<String> features;

        @JsonCreator
        public Configuration(
            @JsonProperty("app_name") String appName,
            @JsonProperty("max_connections") int maxConnections,
            @JsonProperty("features") List<String> features
        ) {
            this.appName = appName;
            this.maxConnections = maxConnections;
            this.features = features;
        }

        @Override
        public String toString() {
            return appName + " (max=" + maxConnections + ", features=" + features + ")";
        }
    }

    public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        mapper.enable(SerializationFeature.INDENT_OUTPUT);

        String json = """
            {
              "app_name": "MyApp",
              "max_connections": 100,
              "features": ["auth", "logging", "cache"]
            }
            """;

        Configuration config = mapper.readValue(json, Configuration.class);
        System.out.println("Deserialized: " + config);

        String output = mapper.writeValueAsString(config);
        System.out.println("Serialized: " + output);
    }
}