REST.java

final ObjectMapper mapper = new ObjectMapper();

try {
	usuario = mapper.writeValueAsString(usuarioRaichu);
	final Client client = ClientBuilder.newClient();
	response = client
			.target(host)
			.request().header("Authorization", authToken)
			.accept(MediaType.APPLICATION_JSON)
			.post(Entity.entity(usuario, "application/json"));
} catch (final JsonProcessingException e) {
	log.log(Level.SEVERE, "Erro ao criar usuário às {0} - {1}",
			new Object[]{LocalDateTime.now().format(DateTimeFormatter.ISO_LOCAL_TIME),
					e.getMessage()});
	throw new UserException("Erro ao criar usuário");
}