Declaring Hibernate event listeners in a JPA environment

Question

Hy guys,

I am working on a project developed in Java EE 5 environment. I want to know how I can declare a Hibernate event listener so that I can be informed when CRUD op

Answer 1

Note that you can also specify this with annotations on the callback methods. Either embed them in the entity itself, or in a separate class, called an entity listener. Here is a snippet taken from the documentation:

@Entity 
@EntityListeners(class=Audit.class)
public class Cat {

    @Id private Integer id;
    private String name;

    @PostLoad
    public void calculateAge() {
       ...
    }
}

public class LastUpdateListener {

    @PreUpdate
    @PrePersist
    public void setLastUpdate(Cat o) {
        ...
    }
}

I guess you can also specify that in the XML config. But annotation are more convenient in my opinion.