score:1
have not tried you example. but running on kubernetes with multiple nodes in google and got the the strange scala collections object when jumping between nodes. this helped me half way.
try creating mapper like below in (my guess) the deserializer.
objectmapper mapper.registermodule(new defaultscalamodule());
also having some problems with the scala mappings. for me now the order is not kept. so lists and maps (linkedhashmap) will loose the original order. :(
Source: stackoverflow.com
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