EntityLIstener not called via OneToOne mapping with cascade

Question

I have an Application object and some Form objects. Each time a Form is saved, I would like to update Application.lastUpdated. Application has an EntityListener which I want to use to set Application.lastUpdated for me.

When I save Application, the EntityListener is called and it works. However when I save Form the EntityListener is not called. I can see this via debugging and via the fact that the lastUpdated field does not change. The Form has a one-way OneToOne relationship with the Application with CascadeType.ALL.

Can I make this setup work? If not, is there a better way of doing it than manually updating Application.lastUpdated each time I save a Form?

I'm using JPA backed by Hibernate and HSQLDB. All the annotations are JPA.

Here's the Form's relationship definition

@Entity public class CourseForm implements Serializable { private static final long serialVersionUID = -5670525023079034136L; @Id @GeneratedValue(strategy = GenerationType.AUTO) long id; @OneToOne(cascade = CascadeType.ALL) @JoinColumn(name = "application_fk") private Application application; //more fields //getters and setters }

The Application looks like this:

@Entity @EntityListeners({ LastUpdateListener.class }) public class Application implements Serializable { @Id @GeneratedValue(strategy = GenerationType.AUTO) long id; private LocalDateTime lastUpdate; //more fields Application() { } public LocalDateTime getLastUpdate() { return lastUpdate; } public void setLastUpdate(LocalDateTime lastUpdate) { this.lastUpdate = lastUpdate; } //getters and setters }

Here's the listener

public class LastUpdateListener { @PreUpdate @PrePersist public void setLastUpdate(Application application) { application.setLastUpdate(LocalDateTime.now()); }

Mark Chorley · Accepted Answer · 2013-05-24 11:55:20Z

I suspect that the above setup doesn't work because the Application object is not actually changed, so that's why @prePersist and @PreUpdate don't get invoked.

I solved the problem by having each Form implement an interface MasterForm:

public interface MasterForm { Application getApplication(); }

Then I moved the EntityListener onto each Form and had it update the Application directly as follows:

public class LastUpdateListener { @PreUpdate @PrePersist public void setLastUpdate(MasterForm form) { form.getApplication().setLastUpdate(LocalDateTime.now()); }

This is working as expected.

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