tech-studies

Spring Boot

2 min read

Spring Boot

roadmap.sh: https://roadmap.sh/spring-boot

Suggested path through the Spring Boot nodes. Each node links to its lesson when written.

Nodes

Prerequisites

  • Core Java
  • Build tools (Maven, Gradle)
  • HTTP and REST basics
  • Relational databases and SQL

Spring Core

  • What is Spring Framework
  • Inversion of Control
  • Dependency injection
  • Beans and the application context
  • Bean scopes
  • Bean lifecycle
  • Component scanning
  • Stereotype annotations
  • Configuration classes
  • Profiles
  • Spring Expression Language (SpEL)
  • Aspect-Oriented Programming (AOP)
  • Event publishing

Spring Boot Basics

  • What is Spring Boot
  • Spring Initializr
  • Auto-configuration
  • Starters
  • Application properties and YAML
  • Externalized configuration
  • @ConfigurationProperties
  • Spring Boot DevTools
  • Embedded servers (Tomcat, Jetty, Undertow)
  • CommandLineRunner and ApplicationRunner

Web and REST

  • Spring MVC
  • @RestController and @Controller
  • Request mapping
  • Path variables and request params
  • Request and response bodies
  • Content negotiation
  • Validation (Bean Validation)
  • Exception handling (@ControllerAdvice)
  • Interceptors and filters
  • CORS
  • HATEOAS
  • OpenAPI / Swagger
  • WebFlux and reactive

Data Access

  • Spring Data overview
  • JDBC Template
  • JPA and Hibernate
  • Spring Data JPA repositories
  • Entity mapping
  • Query methods and JPQL
  • Transactions
  • Pagination and sorting
  • Database migrations (Flyway, Liquibase)
  • Spring Data MongoDB
  • Caching abstraction

Security

  • Spring Security basics
  • Authentication
  • Authorization
  • Password encoding
  • JWT
  • OAuth2 and OpenID Connect
  • Method-level security

Messaging and Integration

  • REST clients (RestTemplate, WebClient, RestClient)
  • Spring for Apache Kafka
  • RabbitMQ / JMS
  • Scheduling tasks
  • Async methods

Testing

  • Unit testing with JUnit and Mockito
  • @SpringBootTest
  • Slice tests (@WebMvcTest, @DataJpaTest)
  • MockMvc
  • Testcontainers

Observability and Production

  • Spring Boot Actuator
  • Health checks and metrics
  • Micrometer
  • Logging configuration
  • Profiles for environments
  • Packaging and running JARs
  • Docker and containerization
  • GraalVM native images

Resources

See resources.md.

Project ideas

  • Build a REST API for a bookstore with Spring Data JPA, Bean Validation, and Flyway migrations.
  • Secure an existing API with Spring Security using JWT auth and method-level authorization.
  • Create an order-processing service that consumes Kafka events and exposes Actuator metrics.

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