@GetMapping, @PostMapping \u2013 Shortcut annotations for specific HTTP methods.<\/li>\n<\/ul>\n\n\n\n13. What is @Autowired?<\/h3>\n\n\n\n
Used for dependency injection. Spring automatically injects the required beans.<\/p>\n\n\n\n
14. What is @Bean?<\/h3>\n\n\n\n
Used in configuration classes to define a Spring bean:<\/p>\n\n\n\n
@Bean\npublic RestTemplate restTemplate() {\n return new RestTemplate();\n}<\/code><\/pre>\n\n\n\nD. Spring Boot Properties & Configuration<\/strong><\/h2>\n\n\n\n15. What is application.properties\/application.yml?<\/h3>\n\n\n\n
Files used to configure Spring Boot applications. Example:<\/p>\n\n\n\n
server.port=8081<\/code><\/p>\n\n\n\nspring.datasource.url=jdbc:h2:mem:testdb<\/code><\/p>\n\n\n\n16. How to read custom properties in Spring Boot?<\/h3>\n\n\n\nUsing @Value:\n\n@Value(\"${custom.property}\")\n\nprivate String customProperty;\n\nOr using @ConfigurationProperties:\n\n@ConfigurationProperties(prefix = \"app\")\n\npublic class AppConfig {\n\n private String name;\n\n \/\/ Getters & Setters\n\n}<\/code><\/pre>\n\n\n\n17. What are Spring Boot Profiles?<\/h3>\n\n\n\n
Profiles allow different configurations for different environments (e.g., dev, prod). Use application-{profile}.properties.<\/p>\n\n\n\n
18. How to activate a profile?<\/h3>\n\n\n\n
In application.properties:
spring.profiles.active=dev
<\/code>Via command line:
java -jar app.jar --spring.profiles.active=prod<\/code><\/p>\n\n\n\nE. Spring Boot Actuator<\/strong><\/h2>\n\n\n\n19. What is Spring Boot Actuator?<\/h3>\n\n\n\n
A module that provides production-ready features like:<\/p>\n\n\n\n
\n- Health checks (\/actuator\/health)<\/li>\n\n\n\n
- Metrics (\/actuator\/metrics)<\/li>\n\n\n\n
- Environment details (\/actuator\/env)<\/li>\n<\/ul>\n\n\n\n
20. How to enable the Actuator?<\/h3>\n\n\n\n
Add the dependency:<\/p>\n\n\n\n
<dependency>\n <groupId>org.springframework.boot<\/groupId>\n <artifactId>spring-boot-starter-actuator<\/artifactId>\n<\/dependency>\nConfigure endpoints in application.properties:\nmanagement.endpoints.web.exposure.include=*<\/code><\/pre>\n\n\n\nF. Spring Boot Database & JPA<\/strong><\/h2>\n\n\n\n21. How to configure a database in Spring Boot?<\/h3>\n\n\n\n
Use application.properties: <\/p>\n\n\n\n
spring.datasource.url=jdbc:mysql:\/\/localhost:3306\/db\nspring.datasource.username=root\nspring.datasource.password=root\nspring.jpa.hibernate.ddl-auto=update<\/code><\/pre>\n\n\n\n22. What is spring.jpa.hibernate.ddl-auto?<\/h3>\n\n\n\n
![\"What](\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/08\/What-is-Spring-Boot_-1200x630.png\" "\\"\\"")
<\/figure>\n\n\n\n![\"key](\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/08\/What-are-the-key-features-of-Spring-Boot_-1200x630.png\" "\\"\\"")
<\/figure>\n\n\n\n![\"Difference](\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/08\/What-is-the-difference-between-Spring-and-Spring-Boot_-1200x630.png\" "\\"\\"")
<\/figure>\n\n\n\n