I'm sorry, but the Apache Commons IO library does not contain a class called "JsonClassDescription". The library provides a set of I/O utilities, including file manipulation, file filters, and file comparators, but it does not have any specific functionality for working with JSON.

If you are looking for a way to read and write JSON in Java, you can use a third-party library such as Jackson or Gson. Here is an example using the Jackson library:

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonExample {
    public static void main(String[] args) throws IOException {
        // Create an object to be serialized
        Person person = new Person("John", "Doe", 30);

        // Create an ObjectMapper instance
        ObjectMapper mapper = new ObjectMapper();

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

        // Print the JSON string
        System.out.println(json);

        // Deserialize the JSON string back to an object
        Person person2 = mapper.readValue(json, Person.class);

        // Print the object
        System.out.println(person2);
    }
}

class Person {
    private String firstName;
    private String lastName;
    private int age;

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

    // Getters and setters
    // ...
}

This example uses the ObjectMapper class from the Jackson library to convert a Person object to a JSON string and back to an object.