Auditing mit @CreatedDate

What is JPA Auditing

Enabling Auditing

@Configuration
@EnableJpaAuditing
public class JpaConfig {
}

Registering the Listener

@Entity
@EntityListeners(AuditingEntityListener.class)
public class Product {
    @Id @GeneratedValue
    private Long id;
}

@CreatedDate

@CreatedDate
private Instant createdAt;

@LastModifiedDate

@LastModifiedDate
private Instant updatedAt;

A Complete Audited Entity

@Entity
@EntityListeners(AuditingEntityListener.class)
public class Product {
    @Id @GeneratedValue
    private Long id;

    @CreatedDate
    private Instant createdAt;

    @LastModifiedDate
    private Instant updatedAt;
}

Auditing the User

@CreatedBy
private String createdBy;

@LastModifiedBy
private String modifiedBy;

AuditorAware

@Bean
public AuditorAware<String> auditorProvider() {
    return () -> Optional.of(
        SecurityContextHolder.getContext()
            .getAuthentication().getName());
}

Reusable Base Class

@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
public abstract class Auditable {
    @CreatedDate
    private Instant createdAt;
    @LastModifiedDate
    private Instant updatedAt;
}

Choosing a Date Type

Verifying Auditing

Product p = repository.save(new Product());
// createdAt == updatedAt
p.setName("New");
repository.save(p);
// updatedAt is now later than createdAt

Quick Check

Recap