Save creationTimestamp and updatedTime in spring + hibernate - spring

Question

I need to update the postgres DB with createdDate and updatedDate
I tried using approach 1, But it is inserting null values.
When I read about, it seems the #prepersist annotations does not work for session.
So I decided to go with Approach 2 : Hibernate #CreationTimeStamp Annotation, I added hibernate-annotations maven dependency, But #CreationTimeStamp is not resolved and gives compilation error.
Can someone advise me on how I can resolve the issue ?
Approach 1
Entity class annotated with #Entity and #Table
public class Status{
#Id
#Column(name = "run_id")
private int run_id;
#Column(name = "status")
private String status;
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "created_date" , updatable=false)
private Date created;
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "updated_date" , insertable=false)
private Date updated;
#PrePersist
protected void onCreate() {
created = new Date();
}
#PreUpdate
protected void onUpdate() {
updated = new Date();
}
//Getters and setters here
}
implementation class is
sessionFactory.getCurrentSession().save(status);
Approach 2
using #CreationTimeStamp and #updatedTimeStamp. But the maven dependency
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-annotations -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-annotations</artifactId>
<version>3.5.0-Final</version>
</dependency>
does not add these annotations to classpath

Answer 1

Is there a reason you are using the session.save() method instead of an entitymanager? I'll post an example of my application using an entitymanager to persist and merge entities. Also I am using java.time.LocalDateTime instead of java.util.Date, that's why I don't need #Temporal.
This may also help: How to use #PrePersist and #PreUpdate on Embeddable with JPA and Hibernate
If you want to use an entitymanager this will help: Guide to the Hibernate EntityManager
Entity class:
public abstract class AbstractEntity implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(updatable = false, nullable = false)
private Long id;
#Column
private LocalDateTime createdTimestamp;
#Column
private LocalDateTime modifiedTimestamp;
#Version
private Long version;
#PrePersist
public void setCreationDateTime() {
this.createdTimestamp = LocalDateTime.now();
}
#PreUpdate
public void setChangeDateTime() {
this.modifiedTimestamp = LocalDateTime.now();
}
//Getter and setter
}
Abstract database service class:
public abstract class AbstractDatabaseService {
#PersistenceContext(name = "examplePU")
protected EntityManager entityManager;
}
Example Entity Repository Interface:
public interface ExampleRepository {
ExampleEntity save(ExampleEntity exampleEntity);
}
Example Entity Repository Implementation:
public class ExampleRepositoryImpl extends AbstractDatabaseService implements ExampleRepository , Serializable {
#Transactional
#Override
public ExampleEntity save(ExampleEntity exampleEntity) {
ExampleEntity toPersist;
// Updating an already existing entity
if (exampleEntity.getId() != null) {
toPersist = entityManager.find(ExampleEntity .class, exampleEntity.getId());
// Omitted merging toPersist with the given exampleEntity through a mapper class here
} else {
toPersist = exampleEntity;
}
try {
toPersist = entityManager.merge(toPersist);
} catch (Exception e) {
// Logging e
}
return toPersist;
}
}
Hope this helps.