Spring Autowired: Beyond Dependency Injection

Most backend bugs in production aren't caused by bad code. They arise from assumptions that were never questioned during development. Common assumptions include: - "This API will always return data." - "The network will always be stable." - "No one will hit this endpoint 1000 times a minute." Defensive programming isn't pessimism; it's simply experience wearing a helmet. #BackendDevelopment #SoftwareEngineering #Java #LessonsLearned

A small mistake that cost me hours of debugging  Recently, I faced an issue in backend code that looked simple at first.  But it took hours to fix because I missed one thing:   Understanding the complete flow before debugging  What I learned:   ✔ Trace the full request flow   ✔ Check logs before jumping into code   ✔ Avoid assumptions  Debugging is not about fixing fast, it’s about understanding deeply.  Have you faced similar situations?  #Java #BackendDevelopment #Debugging #SoftwareEngineering

Some weeks in tech, you don’t build anything new. You just investigate, monitor, restart, compare logs, ask questions, and slowly narrow down one issue. And honestly? That’s real engineering too. Not every productive week ends with a feature release. Sometimes it ends with better understanding. The more I work in backend systems, the more I realize: Building is exciting. Debugging builds experience. #BackendEngineering #Learning #Java

🐛 Debugging is a Superpower Every Developer Needs Real development is not writing code… It’s fixing what breaks. One thing that helped me a lot: 👉 Don’t panic. Read the error carefully. ✔ Check logs ✔ Reproduce issue ✔ Break problem into smaller parts Most bugs are simple — we just overthink them. Great developers = great debuggers. Agree? 👇 #Debugging #Java #Developers #ProblemSolving

🧠 After learning Dependency Injection, I had one big question 👀 Who actually creates these objects in Spring Boot, and when? Today I explored the Spring Bean Lifecycle 🚀 Simple flow 👇 1️⃣ Spring container starts 2️⃣ Bean object is created 3️⃣ Dependencies are injected 4️⃣ Bean becomes ready to use 5️⃣ Bean is destroyed when the app shuts down What made this even more interesting 👇 ✅ @PostConstruct → runs after bean creation ✅ @PreDestroy → runs before bean cleanup 💡 My takeaway: Spring doesn’t just inject dependencies — it also manages the entire lifecycle of the object. The more I learn this framework, the more beautifully engineered it feels ⚡ #Java #SpringBoot #BeanLifecycle #BackendDevelopment #LearningInPublic

🚀 Day 12 – Runnable vs Callable (and why Future matters) While working with threads, I explored the difference between "Runnable" and "Callable". 👉 We often use "Runnable": Runnable task = () -> { System.out.println("Running task"); }; ✔ Doesn’t return any result ✔ Cannot throw checked exceptions --- 👉 Now "Callable": Callable<Integer> task = () -> { return 10; }; ✔ Returns a result ✔ Can throw checked exceptions --- 💡 So where does "Future" come in? Future<Integer> result = executor.submit(task); Integer value = result.get(); 👉 "Future" acts as a placeholder for the result of an asynchronous computation --- 💡 Key takeaway: - Use "Runnable" → when no result is needed - Use "Callable" → when you need result or exception handling This becomes very useful when working with ExecutorService in real applications. #Java #BackendDevelopment #Multithreading #Concurrency #LearningInPublic

Synchronous: Request waits. Thread blocks. Asynchronous: Request moves on. Work continues in background. Blocking: • Simple • Predictable Non-blocking: • Efficient • Scalable But here’s the catch: Async adds complexity: • Debugging • Error handling • Thread management Don’t use async everywhere. Use it where it matters. #Java #Concurrency #SpringBoot

Monday insight: Spring Boot 4.1.0-M3 advances testing annotations and observability, like smarter auto-config in backend pipelines for faster feedback loops. Milestone: https://lnkd.in/g5D8_9mS From framework familiarity, these ease monitoring and testing. Following the 4.1 milestones? What excites you? #SpringBoot #Java #Testing #Observability #TechMilestones

I recently encountered an ambiguous mapping error while working on a REST API. The stack trace was overwhelming, but the message was straightforward : I had two different methods competing for the same URL and HTTP verb. The issue happened because I had two methods, createEmployee and createNewEmployee, both annotated with @PostMapping, along with @RequestMapping on the controller class. Spring couldn't determine which method to use to handle the request. To resolve this, it's essential to keep the endpoints unique or utilize different HTTP methods to maintain organization. Happy coding! #Java #SpringBoot #Programming #SoftwareEngineering #Debugging

🚀 What happens inside Spring Framework when your application starts? From bootstrapping to dependency injection, here’s a complete step-by-step flow of how Spring works internally. Understanding this flow helps developers write better and optimized applications. #Java #SpringBoot #BackendDevelopment #SoftwareEngineering