Issue
I am new to spring and I am confused how @CreatedDate annotation works in an entity.
I did a google search and there were many solutions, but none of them worked for me except one. I am confused why?
This is what I tried first
@Entity
@EntityListeners(AuditingEntityListener.class)
public class User implements Serializable {
@Id
@GeneratedValue
private Long id;
private String name;
@CreatedDate
private Date created;
public User(String name) {
this.name = name;
}
public User() {
}
It did not work. I got NULL for the value in created column.
Then I did this.
@Entity
@EntityListeners(AuditingEntityListener.class)
public class User implements Serializable {
@Id
@GeneratedValue
private Long id;
private String name;
@CreatedDate
private Date created = new Date();
public User(String name) {
this.name = name;
}
public User() {
}
This actually stored the time stamp in the db. My question is most of the tutorials I followed suggested that I do not need new Date() to get the current time stamp. Looks like I do need that. Is there anything I am missing?
Solution
The @CreatedDate won't work by itself if you just put @EntityListeners(AuditingEntityListener.class) on your entities. In order, it'll work you have to do a little more configuration.
Let's say that in your DB the field of @CreatedDate is String type, and you want to return the user that is currently logged in as a value for @CreatedDate, then do this:
public class CustomAuditorAware implements AuditorAware<String> {
@Override
public String getCurrentAuditor() {
String loggedName = SecurityContextHolder.getContext().getAuthentication().getName();
return loggedName;
}
}
You can write there any functionality that fits your needs, but you certainly must have a bean that reference to a class that implements `AuditorAware
The second part and equally important, is to create a bean that returns that class with annotation of @EnableJpaAuditing, like this:
@Configuration
@EnableJpaAuditing
public class AuditorConfig {
@Bean
public CustomAuditorAware auditorProvider(){
return new CustomAuditorAware();
}
}
if your poison is XML configuration then do this:
<bean id="customAuditorAware" class="org.moshe.arad.general.CustomAuditorAware" />
<jpa:auditing auditor-aware-ref="customAuditorAware"/>
Answered By - Moshe Arad
