Annotation Used

@SpringBootApplication: defines spring main class
@ComponentScan: defines base package to discover beans and register with IOC container
@Configuration: defines configuration class that defines beans
@RestController: defines a rest controller that exchange JSON
@RequestMapping: maps controller and its methods with urls
@GetMapping: maps HTTP GET method with method of controller
@PostMapping: maps HTTP POST method with method of controller
@Service: defines a service class
@Transactional: makes a method or class transactional
@Repository: defines DAO class
@Autowired: injects dependency

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