@Data
public class Person implements Serializable {
    private static final long serialVersionUID = 1L;
    static String country = "ITALY";
    private int age;
    private String name;
    transient int height;
}

@SpringBootTest
class TestRepository {


    @Test
    public void test_serializable() throws IOException, ClassNotFoundException {
        Person person = new Person();
        person.setAge(20);
        person.setName("Joe");

        // write to file
        FileOutputStream fileOutputStream = new FileOutputStream("person.txt");
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
        objectOutputStream.writeObject(person);
        objectOutputStream.flush();
        objectOutputStream.close();

        FileInputStream fileInputStream = new FileInputStream("person.txt");
        ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
        Person p2 = (Person) objectInputStream.readObject();
        objectInputStream.close();

        assertTrue(p2.getAge() == person.getAge());
        assertTrue(p2.getName().equals(person.getName()));
    }
}