Banco de dados H2 com Spring Boot

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <scope>runtime</scope>
</dependency>
<!--Adicionado apenas para acessar o console do H2-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

# DATASOURCE
spring.datasource.url=jdbc:h2:file:./data/exemplo
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password

# H2 Console
spring.h2.console.enabled=true
spring.h2.console.path=/h2-console

# JPA
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.jpa.hibernate.ddl-auto=update

import javax.persistence.*;

@Entity
@Table(name = "PERSON")
public class Person {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID", nullable = false)
    private Long id;

    @Column(name = "NAME", length = 50, nullable = false)
    private String name;

    @Deprecated
    public Person() {
    }

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

    public Long getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Person{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

import org.springframework.data.jpa.repository.JpaRepository;

public interface PersonRepository extends JpaRepository<Person, Long> {
}

import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Service;

import java.util.logging.Level;
import java.util.logging.Logger;

@Service
public class PersonService implements ApplicationRunner {

    private static final Logger LOGGER = Logger.getLogger(PersonService.class.getName());

    private final PersonRepository repository;

    public PersonService(PersonRepository repository) {
        this.repository = repository;
    }

    @Override
    public void run(ApplicationArguments args) throws Exception {
        var person = new Person("Gaspar Barancelli Junior");

        LOGGER.log(Level.INFO, "Persist");
        repository.save(person);
        LOGGER.log(Level.INFO, person.toString());

        LOGGER.log(Level.INFO, "Find");
        repository.findById(person.getId()).ifPresent(it -> {
            LOGGER.log(Level.INFO, person.toString());
        });

        var person2 = new Person("Rodrigo Barancelli");

        LOGGER.log(Level.INFO, "Persist");
        repository.save(person2);
        LOGGER.log(Level.INFO, person2.toString());

        person2.setName("Rodrigo Dalla Valle Barancelli");
        LOGGER.log(Level.INFO, "Update");
        repository.save(person2);
        LOGGER.log(Level.INFO, person2.toString());

        LOGGER.log(Level.INFO, "FindAll");
        repository.findAll().forEach(it -> LOGGER.log(Level.INFO, it.toString()));

        LOGGER.log(Level.INFO, "Delete");
        repository.delete(person2);
        LOGGER.log(Level.INFO, person2.toString());
    }
}

Persist
Person{id=1, name='Gaspar Barancelli Junior'}
Find
Person{id=1, name='Gaspar Barancelli Junior'}
Persist
Person{id=2, name='Rodrigo Barancelli'}
Update
Person{id=2, name='Rodrigo Dalla Valle Barancelli'}
FindAll
Person{id=1, name='Gaspar Barancelli Junior'}
Person{id=2, name='Rodrigo Dalla Valle Barancelli'}
Delete
Person{id=2, name='Rodrigo Dalla Valle Barancelli'}