Ward :
I have UserService and MissionService.
Is it ok to inject MissionService in UserSerivce or vice versa?
If yes, what about unit testing?
Fabian Damken :
Of course you can and it is perfectly fine. But I recommend that you use method-injection in order to allow you to set the instance at runtime without using using reflection (you can create an instance manually).
For example:
@Service
public class MissionService { }
@Service
public class UserService {
private MissionService missionService;
@Autowired
public void setMissionService(MissionService missionService) {
this.missionService = missionService;
}
}
This allows you to create both services using regular Java without Spring:
MissionService missionService = new MissioNService();
UserService userService = new UserService();
userService.setMissionService(missionService);
Caution: You have to take care of not building dependency cycles. It is not set that Spring resolves them, I think
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