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Spring Boot

Spring Boot eliminates most Spring Framework boilerplate by providing sensible defaults through auto-configuration. It reads your classpath, detects what you have, and configures beans automatically via @Conditional rules. Understanding auto-configuration — not just using it — is what separates developers who can debug Spring Boot from those who can only use it.

What You'll Find Here​

Notes are being added. Planned topics:

TopicDescription
Auto-Configuration@SpringBootApplication, @EnableAutoConfiguration, @ConditionalOn* conditions.
Application Propertiesapplication.yml, profiles, @ConfigurationProperties, @Value.
Spring Boot StartersWhat's in a starter; common starters (web, data-jpa, security, test, actuator).
ActuatorBuilt-in endpoints (/health, /metrics); custom health indicators; securing endpoints.
Spring Boot Testing@SpringBootTest, test slices (@WebMvcTest, @DataJpaTest), @MockBean.

Learning Path​

  1. Auto-Configuration — understanding @ConditionalOnClass and @ConditionalOnMissingBean demystifies 90% of Boot magic.
  2. Application Properties — @ConfigurationProperties replaces scattered @Value for structured config; learn both.
  3. Starters — know what spring-boot-starter-web wires up (Tomcat, Jackson, Spring MVC).
  4. Actuator — essential for production; understand which endpoints to expose and how to secure them.
  5. Testing — @WebMvcTest and @DataJpaTest slices are faster than @SpringBootTest; know when to use each.
  • Spring Framework — Spring Boot runs on top of Spring Framework; understand the foundation first.
  • Web & REST — Spring MVC and WebFlux are the web layer wired by spring-boot-starter-web.
  • Testing — Spring Boot testing slices and Testcontainers integration are covered there.