mussaddikkhan / spring-contructor-injectio

Constructor injection using Autowired, Primary and Qualifier Annotations

@Autowiring ,@Qualifier and @Primary Annotation with Constructor Injection

Injection Types • Constructor Injection • Use this when you have required dependencies • Generally recommended by the spring.io development team as first choice

Autowiring • Injecting a Coach implementation • Spring will scan @Components • Any one implements HomeWork interface??? • If so, let’s inject them (But If Multiple Classes are implement them then there is an amiguity for this we have two moer annotations i.e @Qualifiers and @Primary.

Which one to use : @Primary or @Qualifier? • @Primary leaves it up to the implementation classes • Could have the issue of multiple @Primary classes leading to an error • @Qualifier allows to you be very specific on which bean you want • In general, I recommend using @Qualifier • More specific • Higher priority