Hibernate Postload and null fields on referenced entities [duplicate]

This question already has an answer here: 开发者_开发百科 Reading a Set in PostLoad on JPA/Hibernate (1 answer) Closed 2 years ago.

I have two entities like the ones below:

@Entity
public class Project {
   @Id
   private id;
   private String name;

   ...
}

@Entity
public class Person {
   @Id
   private id;
   private String name;

   @ManyToOne
   private Project project;

   @PostLoad
   void onLoad(){
      if (project.getName() == null){
         //It's always null!!!
      }
   }


   ...
}

As the code says, on onLoad the field of the related entity is always null -in fact, all field of related entity are null-. I need Hibernate to fetch the field before calling onLoad.

Any idea?

Thanks.

---

You must set a Fetch strategy it might be:

FetchType.LAZY

or

FetchType.EAGER

You should define also the join column with the foreign ID.

In your code:

...
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "project_id")
private Project project;