use of #Value Spring annotation during Controller initialization issue - spring-boot

Question

Probably someone else might have asked something similar as well, but I couldn't find an answer that provides a solution that works...
I'm in the process of learning spring boot and while I was playing with guava RateLimiter during my experiments I hit the following problem:
RateLimiter needs to be created during the Controller initialization, but if I want to load the rate I have to hardcode it, since if I try to load it from props using attributes with #Value Spring annotations it doesn't work.
Is there any "trick" around this "limitation"?
see code below:
#RestController
public class LoggingController {
private Logger logger = LoggerFactory.getLogger(LoggingController.class);
#Value("${count}")
private Double PERMITS_COUNT;
#Value("${seconds}")
private Double PERMITS_PER_SECONDS;
#Value("${consumed}")
private int PERMITS_CONSUMED;
//# Value fails here with NullPointerException
private RateLimiter rateLimiter = RateLimiter.create(PERMITS_COUNT / PERMITS_PER_SECONDS);
// This works file
private RateLimiter rateLimiter = RateLimiter.create(10d / 60d);
private AtomicInteger index = new AtomicInteger(0);
#GetMapping("/logging")
#ResponseBody
public String logging (#RequestParam(name="name", required=false, defaultValue="JavaBoss") String name) {
//#Value works fine if used here
rateLimiter.setRate(PERMITS_COUNT / PERMITS_PER_SECONDS);
rateLimiter.acquire(PERMITS_CONSUMED);
...
Many thanks in advance...

Answer 1

Use PostConstruct and you should be fine
#RestController
public class LoggingController {
private Logger logger = LoggerFactory.getLogger(LoggingController.class);
#Value("${count}")
private Double PERMITS_COUNT;
#Value("${seconds}")
private Double PERMITS_PER_SECONDS;
#Value("${consumed}")
private int PERMITS_CONSUMED;
private RateLimiter rateLimiter;
#PostConstruct
private void createRateLimiter() {
rateLimiter = RateLimiter.create(PERMITS_COUNT / PERMITS_PER_SECONDS);
}
private AtomicInteger index = new AtomicInteger(0);
#GetMapping("/logging")
#ResponseBody
public String logging (#RequestParam(name="name", required=false, defaultValue="JavaBoss") String name) {
...