Java, Spring Data. Mapping entity field of type Map of Lists

Question

For the following entity mapping with Spring Data and Mongo DB :

@Document(collection = "candidates")
public class Candidate {
   private SortedMap<String, ? extends SortedMap<String, List<Expertise>>> expertises;
   ....
}

When loading the entity from the database the List< Expertise> becomes List< LinkedHashMap>. How can I specify the correct type of the object in the list?

Oliver Drotbohm · Accepted Answer · 2014-02-13 11:14:37Z

2

That is a bug in our type resolution algorithm. We resolved the map value type of the outer map to Object, which drops all further generics information and thus no type information got written to the nested documents. This will cause only Maps being created on the reading side.

I've filed DATACMNS-440 for that and fixed it right away. The fix will be transitively included in the upcoming bugfix release (Spring Data MongoDB 1.3.4) early next week.

Still, I'd suggest you create dedicated types for the nested data structure as clients will have a hard time really knowing what this structure actually represents.

answered Feb 13, 2014 at 11:14

Oliver Drotbohm

83.6k19 gold badges236 silver badges219 bronze badges

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

Collectives™ on Stack Overflow

Java, Spring Data. Mapping entity field of type Map of Lists

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