How to map OneToOne relationships between POJOs using @JsonManagedReference and @JsonBackReference

Question

I read

• http://vard-lokkur.blogspot.com/2010/10/json-jackson-to-rescue.html
• http://vard-lokkur.blogspot.com/2010/10/json-jackson-serialization-narrowed.html
• http://www.cowtowncoder.com/blog/archives/2010/09/entry_418.html

looking for solutions to match one-to-one relationships. However, these article demonstrations are Many-to-One or One-to-Many. From the demo, I came to the conclusion that in most cases we will comment on one side as @JsonManagedReference and MANY as @JsonBackReference.

However, there are no hints about how to match one-to-one. Do you have any ideas?

Also, what if it's bidirectional one-to-one?

Answer 1

You can see this as a one-to-many special case; therefore, you will annotate the link from parent to "child" as @JsonManagedReference, and "child" - "parent" as @JsonBackReference.

Another document that may be helpful is the FasterXML Jackson Wiki ; the first example is for a one-to-one relationship and should be applicable to your case.