Spring Data Mongo MongoDB DBRef lazy initialization

Question

I'm using Spring + Spring Data MongoDB. My model is like this:

@Document(collection = "actors")
public class Actor extends DomainEntity {

private String name;
private String surname;
@DBRef(lazy = true)
private List<Class> classes;

The other class is pretty generic, so I don't post it. My problem is that the list "classes" isn't loaded when i try to access it, the attribute remains being some kind of proxy object. Example:

Actor a = actorRepository.findOne(id);
//At this moment classes are a proxy object because of the lazy

//Now I try to load the reference and nothing works
a.getClasses();
a.getClasses().size();
a.getClases().get(0).getAttr();
for(Class g:a.getClasses()){
        g.getAttr();
    }

I considered a ton of options, but no way to make it working...

So, what exactly is the problem? What doesn't work? Which exceptions do you get? What would you like to see? If you don't want a proxy for Class, don't make it lazy. — Oliver Drotbohm
– Oliver Drotbohm, Commented Feb 21, 2015 at 7:59
I think he wants to use lazy, but that in a particular case he needs the bean read from the DB to be fully exploited. This is possible? — pagurix
– pagurix, Commented Jun 14, 2018 at 13:09

Douglas · Accepted Answer · 2015-08-01 04:12:01Z

7

I'm using spring-data-mongodb-1.7.0.RELEASE and I was able to solve this issue by initializing the lazy-loaded collection in its declaration, for instance:

@DBRef(lazy = true)
private List<Class> classes = new ArrayList<>();

answered Aug 1, 2015 at 4:12

Douglas

1,3231 gold badge14 silver badges19 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Spring Data Mongo MongoDB DBRef lazy initialization

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related