Spring Boot auto-configuration, dependency injection, beans, annotations, REST controllers, Spring Data JPA, profiles and Actuator.
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- What does Spring Boot auto-configuration do?
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Automatically configures the Spring application based on jar dependencies found on the classpath.- Which annotation enables Spring Boot auto-configuration?
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@EnableAutoConfiguration or @SpringBootApplication- How do you exclude a specific auto-configuration class in Spring Boot?
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Use the exclude or excludeName attribute in @SpringBootApplication or @EnableAutoConfiguration.- What does the spring-boot-autoconfigure JAR contain?
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Pre-written auto-configuration classes for common frameworks and libraries.- Can you use both @SpringBootApplication and @EnableAutoConfiguration on the same class?
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No, @SpringBootApplication already includes @EnableAutoConfiguration.- What is dependency injection in Spring?
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The process of providing objects with their dependencies rather than having objects create their own dependencies.- Name the three types of dependency injection in Spring.
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Constructor injection, setter injection, and field injection.- Which dependency injection method is recommended for required dependencies?
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Constructor injection.- What does the @Autowired annotation do?
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Marks a field, setter method, or constructor as a place where Spring should inject a dependency.- What is a Spring Bean?
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An object that is instantiated, assembled, and managed by the Spring container.- How do you define a Spring Bean using annotations?
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Use @Bean on a method inside a @Configuration class, or use @Component, @Service, @Repository, or @Controller on a class.- What is the default scope of a Spring Bean?
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Singleton (one instance per Spring container).- Name three Spring Bean scopes.
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Singleton, prototype, request, session, and application.- What annotation marks a class as a component to be detected and registered as a bean?
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@Component- What is the difference between @Service and @Repository?
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Both are specialized @Component stereotypes; @Service is for business logic classes and @Repository is for data access classes.
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