not getting updatedBy field from table using JPA - mysql

Question

I have a table entity_detail that has following structure:
id detail_id center_code Comments updated_by updated_on created_on created_by
1 121 0 Test user 2020-04-22 2020-04-21 user
2 122 1 Test user1 2020-04-22 2020-04-22 user
I have an entity corresponding to this table:
#Entity(name = "entity_detail")
public class EntityDetail extends AuditableEntity {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private Long detailId;
private Boolean centerCode;
private String comments;
}
There is another class AuditableEntity which manages the Audit.
#EntityListeners(AuditingEntityListener.class)
#Data
public class AuditableEntity implements Serializable {
private static final long serialVersionUID = 1L;
#CreatedBy
private String createdBy;
#CreatedDate
private Date createdOn;
#LastModifiedBy
private String updatedBy;
#LastModifiedDate
private Date updatedOn;
}
Now when I try to fetch the data from the table by using id:
savedEntityDetailTest = entityDetailRepository.findById(id);
All the attributes which are coming from AuditableEntity get returned null.
which means when I try to fetch updatedBy field using the following line it returns null.
savedEntityDetailTest.getUpdatedBy();
while when I try to get comments in the same way I get value which is saved in the table.
savedEntityDetailTest.getcomments();
Please suggest me a fixture or workaround.

Answer 1

Add EnableJpaAuditing annotation above your main class.
#SpringBootApplication
#EnableJpaAuditing
public class H2Database2Application {
public static void main(String[] args) {
SpringApplication.run(H2Database2Application.class, args);
}
}
Add MappedSuperclass annotation to the AuditableEntity class.
#EntityListeners(AuditingEntityListener.class)
#MappedSuperclass
#Data
public class AuditableEntity implements Serializable {
private static final long serialVersionUID = 1L;
#CreatedBy
private String createdBy;
#CreatedDate
private Date createdOn;
#LastModifiedBy
private String updatedBy;
#LastModifiedDate
private Date updatedOn;
}
Add Data annotation to the EntityDetail class.
#Entity(name = "entity_detail")
#Data
public class EntityDetail extends AuditableEntity {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private Long detailId;
private Boolean centerCode;
private String comments;
}
And Add AuditorAware like below:
#Component
public class SecurityAuditorAware implements AuditorAware<String> {
#Override
public Optional<String> getCurrentAuditor() {
Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
if (authentication == null || !authentication.isAuthenticated()) {
return Optional.empty();
}
return Optional.of(((User)authentication.getPrincipal()).getUsername());
}
}