Using custom JSON serialization for Spring WebSocket #MessageMapping/#SubscribeMapping - spring

Question

This works fine
In my Spring-based application, I have set up a HTTP-based REST endpoint. This endpoint "speaks" JSON:
#Controller
public class HttpRestController implements RestController {
#Override
#RequestMapping(value = "/users/{user}", method = RequestMethod.GET)
#ResponseBody
public getUser(#PathVariable User user) {
User jsonFriendlyUser = new JacksonAnnotatedUser(user);
return jsonFriendlyUser;
}
}
As these JSON payloads have to follow unusual naming conventions, I used annotations such as #JsonRootName and #JsonProperty to customize the serialized property names:
#JsonRootName("uussaaar")
public class JacksonAnnotatedUser implements User {
//...
public int getId() {
return id;
}
#JsonProperty("naammee")
public String getName() {
return name;
}
#JsonSerialize(using = FriendsJsonSerializer.class )
public Set<User> getFriends() {
return friends;
}
#JsonIgnore
public String getUnimportantProperty() {
return unimportantProperty;
}
}
With this custom JSON metadata, querying /users/123 via HTTP returns the following JSON payload:
{"uussaaar":
{
"id":123,
"naammee":"Charlie",
"friends": [456, 789]
}
}
The following doesn't work as expected
Now I am playing around with Spring's WebSocket support: I want to create a STOMP-based REST endpoint. Therefore i created a StompRestController like this:
#Controller
public class StompRestController implements RestController {
#Override
#SubscribeMapping("/users/{user}")
public getUser(#DestinationVariable User user) { // assuming this conversion works
User jsonFriendlyUser = new JacksonAnnotatedUser(user);
return jsonFriendlyUser;
}
I would have expected for #SubscribeMapping/#MessageMapping to follow the same JSON serialization behavior as #RequestMapping. But this is not the case. Instead, when querying this WebSocket/STOMP endpoint, #SubscribeMapping/#MessageMapping-annotated methods will result in sending a STOMP message to clients with a payload/body corresponding to the "normal" Jackson serialization rules, e.g.
{
"id":123,
"name":"Charlie"
"friends":[{argh recursion}, ...],
"unimportantProperty":"This property shall not be part of JSON serialization"
}
Therefore:
How can I have #SubscribeMapping/#MessageMapping-annotated methods obey custom #JsonXXX annotations for returned values?
Is there another way aside #JsonXXXfor doing such returned value serialization?