@Get("/json")
        @ProducesJson
        @SuppressWarnings("unused")
        public Messages.SimpleRepeatedResponse produceJsonWithRepeatedFields() {
            return Messages.SimpleRepeatedResponse.newBuilder()
                                                  .addAllMessages(ImmutableList.of())
                                                  .build();
        }
Given a ProtobufResponseConverterFunction with a custom JsonPrinter configured via the service builder,
the produced JSON should show that the custom JsonPrinter was used.
protobuf/src/test/java/com/linecorp/armeria/server/protobuf/ProtobufResponseAnnotatedServiceJsonArrayTest.java