Geeksforgeeks Java Backend Development Upd Online

Spring Boot removed 80% of boilerplate.

Key annotations: @SpringBootApplication, @RestController, @RequestMapping, @PathVariable, @RequestBody, @ResponseBody.

GeeksforGeeks Resource: Spring Boot Tutorial geeksforgeeks java backend development upd

| Module | Original GFG Focus | UPD (Upgraded) Focus | | --- | --- | --- | | Core Java | OOP, Multithreading, Collections | + Virtual Threads (Project Loom), Record classes, Pattern matching, Sealed classes | | Build Tools | Maven basics | + Gradle Kotlin DSL, Multi-module projects | | Spring Boot | Basic CRUD, REST | + Spring Security 6 + OAuth2 + JWT, Spring Cloud (Gateway, Config, Discovery), Observability (Micrometer, Prometheus, Grafana), Spring Modulith | | Database | JDBC, Hibernate, MySQL | + PostgreSQL (JSONB), Flyway/Liquibase, NoSQL integration (MongoDB), Transaction management deep dive | | Testing | JUnit basics | + Testcontainers, Mockito, @WebMvcTest, @DataJpaTest, Contract testing (Pact) | | Messaging | Not present | + RabbitMQ / Kafka, Event-driven architecture | | DevOps / Deployment | Git, basic deployment | + Docker, Kubernetes (minikube), CI/CD (GitHub Actions), Environment config (Spring profiles, ConfigMaps) | | Monitoring & Logging | System.out / log4j basics | + ELK Stack (Elasticsearch, Logstash, Kibana), OpenTelemetry, Distributed tracing | | API Design | REST only | + OpenAPI 3 (Swagger), GraphQL (basic), Versioning strategies | | Security | Basic login example | + CORS, CSRF, Rate limiting, HTTPS, Secrets management, Role-based access control (RBAC) |

Before diving into frameworks, a strong command of the language itself is mandatory. Spring Boot removed 80% of boilerplate

  • Collections Framework: Essential for handling data in memory.
  • Exception Handling: Try-catch blocks, throw vs. throws, and creating custom exceptions.
  • Multithreading & Concurrency: Understanding threads, synchronization, the Executor Service, and the Runnable interface.
  • Java 8 Features: Modern Java relies heavily on functional programming concepts.

    • Java backend developers write complex queries daily.

    Practice: LeetCode Database section (hard problems). Before diving into frameworks, a strong command of

    GeeksforGeeks Resource: SQL Tutorial

    A backend developer must know how to store and retrieve data efficiently.

  • JDBC (Java Database Connectivity):

    • | Topic | GFG Resource Example | |-------|----------------------| | Spring Boot tutorial | “Spring Boot – Hello World Example” | | REST API | “REST API with Spring Boot” | | JPA | “Spring Boot – Spring Data JPA” | | Security | “Spring Boot Security with JWT” | | Testing | “Mockito and JUnit 5 Tutorial” |

    Object-Relational Mapping (ORM) done right.