Is there any way to immediately return response and do something async after in Spring Boot?

Question

How to send immediately a HTTP-response and do further processing afterwards in Spring Boot?

My code:

@Configuration
@EnableAsync
public class Application Configuration {
....
}

then a function in my Service which is long running and should be executed asynchronously

@Service
public class MyService {

@Async
public void executeDBUpdate() {
...log.info(Thread.getCurrentThread.getName());
}
}

and my Controller:

@PostMapping("/update")
@ResponseStatus(HttpStatus.ACCEPTED)
public ResponseEntity<String> updateDB() {
...
   log.info(Thread.getCurrentThread.getName());
   ComparableFuture.runAsync(() - > myservice.executeDBUpdate());
   return new ResponseEntity<>(HttpStatus.ACCEPTED);

I would expect that HttpStatus.ACCEPTED is send immediately and executeDBUpdate is running in separate Thread still further. Looking at thread name in fact I see different threads, so a new thread is used for executeDBUpdate.

But the HttpStatus.ACCEPTED is not send immediately, but only after the AsyncTask is done, even if in Debugger I see that updateDB() is processed immediately further

Is thee any way to send response immediately?

You don't need runAsync as the method is already @Async so you can just call the method on the service. You are now using 2 threads where you would use 1 otherwise (or actually 3 instead of 2). — M. Deinum
– M. Deinum, Commented Aug 31, 2023 at 11:19

DigitalMachine · Accepted Answer · 2023-08-31 10:16:39Z

2

OK, solved it. It works as designed, however not if you set Breakpoint in the application. If you debug and have breakpoints, processing is stopped here and response sending after leaving debugger.

Using Thread.sleep I see desired response

answered Aug 31, 2023 at 10:16

DigitalMachine

1251 silver badge10 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Is there any way to immediately return response and do something async after in Spring Boot?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related