DIWithSetters.java

@Component
class ParentService {
  ...
  @Autowired
  public void setChildService(ChildService childService) {
    this.childService = childService;
  }
}

@Component
class MyService {
  private ParentService parentService;
  ...
  public void corruptTheRuntime() {
    parentService.setChildService(null);
  }
}