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Spring Core (XML (config.xml (<bean> (attribute (class (fully…

- - - - package_path/filename.xml
  - - - xml definition
    - - attribute
        
        class
        
        fully qualified classname
        
        id
      - <properties>
        
        setter injection
        
        attribute
        
        name
        
        value
      - <constructor-arg>
        
        constructor injection
        
        attribute
        
        index
        
        type
        
        value
    - - attribute
        
        base-package
- - - - ConfigBean.class
  - - - attached: Class definition
      - purpose: IOC Component
      - @Primary
        
        for multiple implementations
    - - purpose: injection point
      - attached: variables declaration
      - @Qualifier
        
        for multiple implementations
    - - purpose: specify Bean Config class
      - attached: class definition
      - @Bean
        
        purpose: specify an instance to return for DI
        
        attached: method definition
      - @ComponentScan
        
        purpose: scan for an implementation for DI
        
        attached: class definition (Bean Config)
- - - - by depending on abstraction
      - by using dependency injection
      - by setting configuration