Guava rate limiter

GiavaRateLimiter.java

private RateLimiter createGuavaRateLimiter() {
        double permitsPerSecond = ((double) hourlyLimit) / (60d * 60); // hourlyLimit / seconds-per-hour
        logger.info("Creating rate limiter with {} permits per seconds", permitsPerSecond);
        RateLimiter rateLimiter = RateLimiter.create(permitsPerSecond);
        // initialize with a full number of permits. Use refleciton, as guava does not expose that functionality
        try {
            Class<?> limiterClass = Class.forName("com.google.common.util.concurrent.SmoothRateLimiter");
            Field field = ReflectionUtils.findField(limiterClass, "storedPermits");
            ReflectionUtils.makeAccessible(field);
            ReflectionUtils.setField(field, rateLimiter, hourlyLimit);
            
            Field maxField = ReflectionUtils.findField(limiterClass, "maxPermits");
            ReflectionUtils.makeAccessible(maxField);
            ReflectionUtils.setField(maxField, rateLimiter, hourlyLimit);
            
            Field burstField = ReflectionUtils.findField(Class.forName("com.google.common.util.concurrent.SmoothRateLimiter$SmoothBursty"), "maxBurstSeconds");
            ReflectionUtils.makeAccessible(burstField);
            setFinal(burstField, rateLimiter, 10);
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
        return rateLimiter;
    }