Java Framework

Spring Boot Learning Roadmap

Spring Boot is the industry-standard Java framework for building backend services and microservices — required knowledge for virtually all enterprise Java positions. It provides auto-configuration, dependency injection, REST controllers, JPA/ORM, security, and production-ready monitoring out of the box. If Java is the language of enterprise software, Spring Boot is the framework that makes building it practical.

Total time

3–5 months

Stages

5 stages

Job-ready at

Stage 3

Career paths

2 paths

Before you start — Prerequisites

✓

Java fundamentals (OOP, generics, collections)

Spring Boot is Java — you need solid Java before picking up the framework.

✓

Basic HTTP and REST concepts

Spring Boot builds REST APIs — knowing what HTTP methods, status codes, and JSON mean is essential.

✓

Maven or Gradle basics

Spring Boot projects are built with Maven/Gradle. Understanding dependency management avoids hours of debugging.

Stage 1: Spring Core & IoC

Dependency injection and application context

1–2 weeks

Topics to cover

Spring initializr and project structureIoC container and ApplicationContext@Component, @Service, @Repository, @Controller@Autowired and constructor injection@Bean and @Configuration classesapplication.yml and @Value for configProfiles: @Profile and spring.profiles.active@Conditional annotationsSpring Boot auto-configuration explainedActuator: /actuator/health and /actuator/info

Bold = especially important

Milestone

You understand how Spring wires beans together, inject dependencies via constructor injection, and configure the application with YAML.

Project to build

Bean wiring demo

Three-layer app (controller → service → repository), all wired via @Component/@Autowired, config values from YAML, two profiles (dev/prod).

Stage 2: Spring MVC & REST APIs

Building HTTP endpoints

2–3 weeks

Topics to cover

@RestController and @RequestMapping@GetMapping, @PostMapping, @PutMapping, @DeleteMapping@PathVariable and @RequestParam@RequestBody and response DTOsResponseEntity for status codes and headersBean Validation: @Valid, @NotNull, @Size, @Email@ControllerAdvice and @ExceptionHandlerCORS configurationContent negotiation: JSON vs XMLSwagger/OpenAPI with springdoc-openapi

Bold = especially important

Milestone

You build a complete REST API with proper status codes, validation, and global exception handling — tested with Postman or curl.

Project to build

Library REST API

Book CRUD: @PostMapping with @Valid, @GetMapping list + single, @PutMapping update, @DeleteMapping, @ControllerAdvice for 404/400 errors.

Stage 3: Spring Data JPA

✓ Min. Job Ready

Database access with JPA and Hibernate

2–3 weeks

Topics to cover

@Entity, @Table, @Column, @Id, @GeneratedValueJpaRepository: save, findById, findAll, deleteDerived query methods: findByName, findByAgeGreaterThan@Query with JPQL and native SQL@OneToMany, @ManyToOne, @ManyToMany relationshipsLazy vs eager loading — N+1 problemPagination: Pageable and Page<T>Flyway or Liquibase for schema migrations@Transactional and transaction managementSpecifications for dynamic queries

Bold = especially important

Milestone

You build a Spring Boot app with full JPA persistence: entities, relationships, JPQL queries, pagination, and Flyway migrations.

Project to build

Blog platform API

Post, User, Tag entities with relationships, pagination with Pageable, Flyway migrations, @Transactional for post creation with tag assignment.

Stage 4: Spring Security

Authentication and authorization

2–3 weeks

Topics to cover

SecurityFilterChain and security configurationUserDetailsService and UserDetailsBCryptPasswordEncoder for password hashingJWT authentication filterJWT generation and validation with jjwt@PreAuthorize and method-level securityRole-based access control (RBAC)OAuth2 Resource Server for JWT validationOAuth2 Login for social authCSRF protection (when to enable/disable)

Bold = especially important

Milestone

You secure your API with JWT — registration, login, token validation, and role-based endpoint access.

Project to build

Secured blog API

JWT login/register, UserDetailsService with PostgreSQL, ADMIN can delete any post, USER can only delete own posts, @PreAuthorize annotations.

Stage 5: Production & Microservices

Testing, Docker, and cloud deployment

3–4 weeks

Topics to cover

JUnit 5 + Mockito for unit tests@SpringBootTest + MockMvc for integration testsTestcontainers for PostgreSQL in testsDockerfile and multi-stage build for Spring BootDocker Compose: Spring Boot + PostgreSQL + RedisActuator: /health, /metrics, /prometheusSpring Cloud: service discovery and config serverKafka integration with Spring KafkaDeploy to Kubernetes with Deployment + ServiceGraceful shutdown and readiness/liveness probes

Bold = especially important

Milestone

Your Spring Boot app has unit + integration tests, runs in Docker Compose, exposes Prometheus metrics, and deploys to Kubernetes.

Project to build

Production-ready microservice

Blog API with tests (JUnit + MockMvc), Dockerfile, Compose with Postgres + Redis cache, Kafka for email events, K8s manifests, /actuator/prometheus.

What to learn next with Spring Boot

Skills that pair directly with Spring Boot in job postings

Java

Deepen Java — generics, streams, concurrency — Spring Boot uses all of these

Docker

Containerise Spring Boot microservices — Docker is required for modern deployments

Kubernetes

Deploy Spring Boot to K8s — the standard enterprise container platform

Kafka

Spring Cloud Stream makes Kafka + Spring Boot event-driven architectures simple

AWS

Deploy Spring Boot to ECS, EKS, or Lambda with Spring Cloud AWS

Career paths that use Spring Boot

Backend Developer Full Stack Developer

Frequently asked questions

What is the difference between Spring and Spring Boot?

Spring Framework is the core: dependency injection, AOP, transactions, MVC. Spring Boot adds opinionated auto-configuration on top — it wires everything together so you don't write 500 lines of XML config. Spring Boot detects what's on your classpath and configures it automatically. In 2025, you always start with Spring Boot; raw Spring configuration is legacy.

What is dependency injection and why does Spring use it?

Dependency injection (DI) means objects don't create their own dependencies — they receive them from an external source (the Spring IoC container). This makes code testable (inject mocks in tests), loosely coupled (swap implementations), and maintainable (centralized wiring). Spring's @Autowired and @Bean annotations are how DI is expressed. It's the core pattern that makes Spring applications testable and extensible.

Is Spring Boot only for REST APIs?

No — Spring Boot supports REST APIs, GraphQL APIs, gRPC services, batch processing (Spring Batch), event-driven applications (Spring Cloud Stream with Kafka), scheduled tasks (@Scheduled), WebSocket servers, and server-rendered HTML (Spring MVC + Thymeleaf). REST APIs are the most common use case, but Spring Boot is a complete application platform.

Spring Data JPA vs Hibernate — what is the difference?

Hibernate is the JPA implementation — it translates Java objects to SQL. Spring Data JPA is a layer on top of Hibernate that provides repository interfaces (JpaRepository) so you get CRUD, pagination, and sorting with zero SQL. Spring Data JPA generates the implementation at runtime. You use Spring Data JPA in code; Hibernate works underneath automatically.

Do I need to learn Spring Security?

Yes — Spring Security is required for production applications. It handles authentication (who are you?) and authorization (what can you do?). Common patterns: form login with sessions, JWT bearer tokens for REST APIs, and OAuth2/OIDC for social login. Spring Security is complex but almost every Spring Boot job description lists it. Budget 2–3 weeks specifically for Spring Security concepts.

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