ReactiveUserDetailsService (spring-security-core 5.7.1 API)

All Known Implementing Classes:

MapReactiveUserDetailsService
```
public interface ReactiveUserDetailsService
```
An API for finding the UserDetails by username.

Since:

5.0

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`reactor.core.publisher.Mono<UserDetails>`	`findByUsername(java.lang.String username)`	Find the `UserDetails` by username.

- Method Detail
  - findByUsername
```
reactor.core.publisher.Mono<UserDetails> findByUsername(java.lang.String username)
```
    Find the UserDetails by username.
    
    Parameters:
    
    username - the username to look up
    
    Returns:
    
    the UserDetails. Cannot be null