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This tutorial code used to explain Spring Core concepts:

• IoC Container
• Spring context
• Bean definition(@Bean, @Component, @Service, etc => Stereotype annotations)
• @ComponentScan feature and XML-based bean definition
• D.I
• Spring Bean Scope(Singleton, Prototype)
• Lazy bean loading
• Qualifier and define custom Alias for bean accessibility
• Spring Bean Lifecycle and callback methods(@PostConstruct and @PreDestroy)
• Import configuration
• Spring Profile and activation profiles
• Property Source
• Value with SpEL