private static final Logger log = LoggerFactory.getLogger(MyClass.class);
log.info("User {} logged in", userId);

| Topic | Sample GFG Question | | :--- | :--- | | Multithreading | "Print numbers from 1 to N sequentially using three threads." | | JVM Internals | "Explain the Garbage Collection process (Young/Old generation)." | | Spring Boot | "How does @Autowired work? What is component scanning?" | | Performance | "How to find the bottleneck in a slow REST API?" | | SQL | "Write a query to find the nth highest salary without using LIMIT." |

Theory is useless without application. The GeeksForGeeks path distinguishes itself by forcing the student to build end-to-end projects.

jdbcTemplate.query("SELECT * FROM users", new BeanPropertyRowMapper<>(User.class));

A clean API is a contract between backend and frontend.

In the ever-evolving landscape of software engineering, Java remains the unshakable titan of backend development. From powering global financial systems to being the backbone of Android and large-scale enterprise applications, Java’s relevance is timeless. When you combine the robustness of Java with the structured learning resources of GeeksForGeeks (GFG) , you unlock a proven pathway to becoming a high-demand backend developer.

This article serves as your comprehensive guide to navigating the GeeksForGeeks - JAVA Backend Development ecosystem. Whether you are a fresher preparing for campus placements or a professional upskilling for a senior role, we will cover the core concepts, advanced frameworks, database integration, and system design principles that GFG excels at teaching.

@RestController
@RequestMapping("/api/users")
public class UserController 

@Autowired
private UserService userService;
@GetMapping("/id")
public ResponseEntity<UserDto> getUser(@PathVariable Long id) 
    return ResponseEntity.ok(userService.findById(id));

GFG recommends Maven for beginners due to structured XML and large community support.