ThreadPoolExecutor and Spring Async - spring

Question

Initially I was using regular java Multithreading using the 'implements' method. However #Autowired does not work when a class is created with new in Spring, so I am trying to change it to using Spring'sAsync method. This is what I have so far. How would I go about adding the threads to the ThreadPoolExecutor?
The class that should create the threads
#Component
public class ScheduledCountyScraper {
#Autowired
StateScrapeQueueRepository stateScrapeQueueRepository;
#Autowired
CountyScrapeRepository countyScrapeRepository;
// #Scheduled(cron = "0 0 */3 * * *")
#EventListener(ApplicationReadyEvent.class)
public void scrapeCountyLinks() {
System.out.println("Scrape county links ran!");
try {
List<String> stateLinks = stateScrapeQueueRepository.getStatesLinks(website);
ThreadPoolExecutor executor = (ThreadPoolExecutor) Executors.newFixedThreadPool(1);
//what to do here?
executor.shutdown();
} catch (Exception e) {
e.printStackTrace();
} finally {
System.out.println("---------------------");
}
}
}
The Async class
#Component
#EnableAsync
public class CountyScraper {
volatile private String stateLink;
#Autowired
StateScrapeQueueRepository stateScrapeQueueRepository;
#Autowired
CountyScrapeRepository countyScrapeRepository;
public CountyScraper() {
}
public CountyScraper(String stateLink) {
this.stateLink = stateLink;
}
#Async("countyScraper")
public void run() {
try {
// other code
stateScrapeQueueRepository.updateScrapeTimestamp(stateLink);
countyScrapeRepository.insertCountyLinks(countyLinks, website);
} catch (Exception e) {
e.printStackTrace();
}
}
}

Answer 1

By default Spring uses a SimpleAsyncTaskExecutor to execute async methods. This will by default spawn a new thread for every operation.
To define your own executor for use with async tasks, create a bean that implements the TaskExecutor interface or an Executor bean named "taskExecutor".
If you'd like to have your own custom executor just for this component, you can implement AsyncConfigurer and provide your own executor service:
#Override
public Executor getAsyncExecutor() {
return MY_EXECUTOR;
}
#Override
public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
return MY_EXCEPTION_HANDLER;
}