When @Autowired is used on a dependency, the application context searches for a matching dependency. By default, all dependencies that are autowired are required.
Possible results are as follows:
- One match is found: This is the dependency you are looking for
- More than one match is found: Autowiring fails
- No match is found: Autowiring fails
Cases where more than one candidate is found can be resolved in two ways:
- Use the @Primary annotation to mark one of the candidates as the one to be used
- Use @Qualifier to further qualify autowiring
