Why @Async Annotation Clauses AopInvocationException?

Question

Here is a code snippet:

@GetMapping("/account")
@SuppressWarnings("unchecked")
public UserDTO getAccount(Principal principal) {
    ...
    janitorService.cleanUp((AbstractAuthenticationToken) principal);
    ...
}

@Component
public class JanitorService {
  ...
  @Async
  public boolean cleanUp(AbstractAuthenticationToken authToken){
    ...
    return true;
  }

}

and there is an async configuration class.

org.springframework.aop.AopInvocationException: Null return value from advice does not match primitive return type for: public boolean com.mycompany.myteam.JanitorService.cleanUp(org.springframework.security.authentication.AbstractAuthenticationToken)

The exception won't be thrown after @Async is removed. The reason I use @Async is to kick off a thread. Why does it cause the exception?

Does this answer your question? [Will an aspect be executed asynchronously if I put @Async method on it?](https://stackoverflow.com/questions/58275121/will-an-aspect-be-executed-asynchronously-if-i-put-async-method-on-it) — kriegaex, Sep 25 '21 at 08:34
Not on the same topic, but it is nice to learn some related knowledge. — vic, Sep 25 '21 at 17:56
It is the same topic, I am explaining exactly why your exception occurs. — kriegaex, Sep 25 '21 at 21:07

score 0 · Accepted Answer · answered Sep 23 '21 at 01:35

0

For @Async methods with return, the return should be a Future<T> not a T. Try returning Future<Boolean> Source: https://www.baeldung.com/spring-async

answered Sep 23 '21 at 01:35

leoconco

253
3
15

Thanks for the info. I only read a sample code with the void return type. – vic Sep 23 '21 at 20:26

Why @Async Annotation Clauses AopInvocationException?

1 Answers1