DemoApplication.java

package com.example.demo;

import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.Data;
import lombok.Getter;
import lombok.NoArgsConstructor;
import org.hibernate.annotations.CreationTimestamp;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.data.jpa.domain.AbstractPersistable;
import org.springframework.data.repository.CrudRepository;

import javax.persistence.Entity;
import javax.persistence.MappedSuperclass;
import java.time.Instant;
import java.util.stream.Stream;

@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Bean
    public CommandLineRunner commandLineRunner(PersonRepository repository, ObjectMapper objectMapper) {
        return args -> {
            Stream.of("Jan", "Wouter")
                .map(Person::new)
                .forEach(repository::save);

            Person p = repository.findByName("Jan");

            objectMapper.writeValue(System.out, p);
        };
    }
}

@Getter
@MappedSuperclass
abstract class Auditable extends AbstractPersistable<Long> {

    @CreationTimestamp
    private Instant createdDate;

}

@Data
@NoArgsConstructor
@Entity
class Person extends Auditable {

    private String name;

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

}

interface PersonRepository extends CrudRepository<Person, Long> {
    Person findByName(String name);
}