@ToString(callSuper = true)

This is a Java annotation that can be used to generate a `toString` method in a class. The `callSuper` attribute is set to `true`, which means that the generated `toString` method will also include the output of the `toString` method of its superclass (if it has one).

For example, consider the following class hierarchy:

public class Animal {
    private String name;

    public Animal(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Animal{name='" + name + "'}";
    }
}

public class Dog extends Animal {
    private String breed;

    public Dog(String name, String breed) {
        super(name);
        this.breed = breed;
    }

    @Override
    public String toString() {
        return "Dog{breed='" + breed + "', " + super.toString() + "}";
    }
}

If we create a `Dog` object and call its `toString` method, we would get:

Dog{breed='Labrador', Animal{name='Buddy'}}

This is because the `Dog` class overrides the `toString` method of its superclass (`Animal`), and includes the output of the `Animal` class's `toString` method by calling `super.toString()` and concatenating it with the `breed` attribute.

If we annotated the `Dog` class with `@ToString(callSuper = true)`, Lombok would generate the `toString` method for us, which would be equivalent to the one we manually wrote above:

@ToString(callSuper = true)
public class Dog extends Animal {
    private String breed;

    public Dog(String name, String breed) {
        super(name);
        this.breed = breed;
    }
}