private final BlockingQueue<Runnable> executorQueue = new ArrayBlockingQueue<>(20);
private final ThreadPoolExecutor executor = new ThreadPoolExecutor(4,4,5, TimeUnit.MINUTES, executorQueue);

@PostConstruct
public void startExecutor() {
    executor.prestartAllCoreThreads();
}

public void manageRequest(Request request) {
    log.info("Start manage request {}", request.getRequestId());
    executorQueue.add(() -> {
        // do something
    });
}