Java ObjectIdGenerators-class And Method Code Example

I apologize, but there is no class called "ObjectIdGenerators" in the Apache Commons IO library. This library provides utility classes for working with IO operations such as file manipulation, input/output streams, and file filters. It doesn't include any functionality for working with object IDs.

However, if you're using Jackson for JSON serialization and deserialization, it does provide a feature called "Object Ids" which allows you to handle object identity when serializing/deserializing. Object Ids can be used to handle cases where multiple references to the same object occur in the JSON data.

Here's an example of how you can use Object Ids with the Jackson library:

import com.fasterxml.jackson.annotation.JsonIdentityInfo;
import com.fasterxml.jackson.annotation.ObjectIdGenerators;
import com.fasterxml.jackson.databind.ObjectMapper;

public class ObjectIdExample {
    public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper();

        // Create an object graph with multiple references to the same object
        Person person1 = new Person("John", "Doe", 30);
        Person person2 = new Person("Jane", "Doe", 28);

        // Serialize the object graph to a JSON string
        String json = mapper.writeValueAsString(person1);

@JsonIdentityInfo(generator=ObjectIdGenerators.PropertyGenerator.class, property="id")
class Person {
    private int id;
    private String firstName;
    private String lastName;
    private int age;
    private Person spouse;

    public Person(String firstName, String lastName, int age) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.age = age;

    // getters and setters...

This will output the following JSON string:


As you can see, the JSON string contains an "id" property for each Person object, and the value of the "id" property is used to represent the object in the JSON string. The JsonIdentityInfo annotation is used to specify that the ObjectIdGenerators.PropertyGenerator should be used to generate the object IDs, and that the "id" property of the Person class should be used as the ID.

You can use different ObjectIdGenerators to generate the ids based on your needs.

Please note that this is just a basic example, and the actual implementation might vary depending on your use case.