CandidateListService.java

public List<CandidateVoterView> getCandidatesMessageRpc(String election) {
    logger.debug("Sending RPC request message for list of candidates...");

    String requestMessage = election;
    String candidates = (String) rabbitTemplate.convertSendAndReceive(
            directExchange.getName(), "rpc", requestMessage);

    TypeReference<Map<String, List<CandidateVoterView>>> mapType =
            new TypeReference<Map<String, List<CandidateVoterView>>>() {};

    ObjectMapper objectMapper = new ObjectMapper();

    Map<String, List<CandidateVoterView>> candidatesMap = null;

    try {
        candidatesMap = objectMapper.readValue(candidates, mapType);
    } catch (IOException e) {
        logger.info(String.valueOf(e));
    }

    List<CandidateVoterView> candidatesList  = candidatesMap.get("candidates");
    logger.debug("List of {} candidates received...", candidatesList.size());

    return candidatesList;
}