Auditing Configuration (Spring Boot 2.0)

AuditableEntity.java

import lombok.*;
import org.springframework.data.annotation.CreatedBy;
import org.springframework.data.annotation.CreatedDate;
import org.springframework.data.annotation.LastModifiedBy;
import org.springframework.data.annotation.LastModifiedDate;
import org.springframework.data.jpa.domain.support.AuditingEntityListener;

import javax.persistence.EntityListeners;
import javax.persistence.MappedSuperclass;
import java.util.Calendar;

@Getter
@AllArgsConstructor
@NoArgsConstructor
@ToString
@EqualsAndHashCode
@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
public class AuditableEntity {
    @CreatedBy
    private String createdBy;

    @CreatedDate
    private Calendar createdDate;

    @LastModifiedBy
    private String lastModifiedBy;

    @LastModifiedDate
    private Calendar lastModifiedDate;
}

AuditingConfig.java

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.domain.AuditorAware;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;

import java.util.Optional;

@Configuration
@EnableJpaAuditing
public class AuditingConfig {

    @Bean
    public AuditorAware<String> auditorAware() {
        return () -> {
            Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
            if (authentication == null || !authentication.isAuthenticated() ||
                    !(authentication.getPrincipal() instanceof Principal)) {
                return Optional.of("anonymousUser");
            }

            Principal principal = authentication.getPrincipal();
            return Optional.of(userDetailsPrincipal.getName());
        };
    }
}