Using ConfigurationProperties to fill Map in generic way

Question

I\'m wondering, if there is a generic way to fill a map with properties you just know the prefix.

Assuming there are a bunch of properties like

names         


        

Answer 1

I was going nuts trying to understand why @Andy's answer wasn't working for me (as in, the Map was remaining empty) just to realize that I had Lombok's @Builder annotation getting in the way, which added a non-empty constructor. I'm adding this answer to emphasize that in order for @ConfigurationProperties to work on Map, the value type must have a No-Arguments constructor. This is also mentioned in Spring's documentation:

Such arrangement relies on a default empty constructor and getters and setters are usually mandatory ...

I hope this will save someone else some time.