Difference between and

Question

I\'m learning Spring 3 and I don\'t seem to grasp the functionality behind and .

Answer 1

Only resolves the @Autowired and @Qualifer annotations, that's all, it about the Dependency Injection, There are other annotations that do the same job, I think how @Inject, but all about to resolve DI through annotations.

Be aware, even when you have declared the element, you must declare your class how a Bean anyway, remember we have three available options

• XML:
• @Annotations: @Component, @Service, @Repository, @Controller
• JavaConfig: @Configuration, @Bean

Now with

It does two things:

• It scans all the classes annotated with @Component, @Service, @Repository, @Controller and @Configuration and create a Bean
• It does the same job how does.

Therefore if you declare , is not necessary anymore declare too.

Thats all

A common scenario was for example declare only a bean through XML and resolve the DI through annotations, for example

We have only declared the beans, nothing about and , the DI is configured in their own classes through @Autowired. It means the Services use @Autowired for their Repositories components and the Repositories use @Autowired for the JdbcTemplate, DataSource etc..components