Async Programming: When to Use and Its Trade-Offs

Day 95/200 – LeetCode Challenge. Problem: Remove Duplicates from Sorted List II (Java) Today’s focus was eliminating all duplicate values from a sorted linked list while keeping only distinct nodes. Implemented an efficient two-pointer approach with a dummy node to handle edge cases cleanly. Linked lists require careful pointer management. Dummy nodes simplify boundary conditions. One-pass solution ensures optimal performance. Continuing the 200-day journey, one problem at a time. #LeetCode #Java #CodingChallenge #200DaysOfCode #ProblemSolving

A small habit that saved me countless debugging hours: Always add meaningful logs. Not just: “Error occurred” But: “Payment service failed while calling order service – orderId:123” Future you (or another developer) will thank you. #Java #CleanCode #SoftwareDevelopment

Day 42 of consistency 💻🔥 Solved Add Two Numbers using linked lists — a classic problem that really tests understanding of pointers, carry handling, and edge cases. Key takeaways: Handling carry efficiently is crucial Dummy nodes make list problems much cleaner Iterative approach keeps space optimal Not the fastest runtime yet, but improvement is a process — optimizing step by step. Consistency > Perfection. #Day42 #LeetCode #DSA #Java #CodingJourney #ProblemSolving #100DaysOfCode

https://lnkd.in/d2QuDRvF Most “exciting” releases break your code. #Java26 doesn’t. It compiles, runs, and improves performance—thanks to G1 GC and HTTP/3. Lutske de Leeuw & Johannes Bechberger explain why boring wins. See why boring tech is a competitive advantage. Read their article! #Java #JVM

Virtual threads Traditional thread-per-request models were expensive. Virtual threads make concurrency cheap, scalable, and easier to reason about. Every new Spring Boot service has spring.threads.virtual.enabled=true set by default. The era of reactive-by-default for I/O-bound work is fading fast — teams are writing straightforward, blocking-style code and still achieving WebFlux-level concurrency. Before Virtual Threads: → You needed reactive programming (WebFlux, RxJava) to handle high concurrency → Reactive code is hard to read, hard to debug, hard to onboard → Context switching between threads was expensive at scale After Virtual Threads: → Write simple, imperative code → JVM handles millions of lightweight threads natively → Same or better throughput — zero reactive complexity Why this matters: → Reactive code was powerful but painful to write and debug → Virtual threads give you the same performance with half the complexity #Java #SpringBoot #BackendDevelopment #Microservices #VirtualThreads

🚀 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

The real reason legacy systems become painful Legacy is often not “old code” — it’s code nobody can safely change. A system is not legacy because it’s 5 or 10 years old. It becomes legacy when: - nobody understands the side effects - changes feel dangerous - deployments create fear - debugging takes too long - the architecture stopped communicating intent That’s why I don’t judge code only by syntax or age. I judge it by one question: How safely can a team change it? That’s why things like these matter so much: - clear boundaries - good naming - testability - observability - domain clarity A codebase becomes expensive long before it becomes “outdated”. #LegacyCode #SoftwareEngineering #Java #SpringBoot #Refactoring #BackendDevelopment

Most developers think @Autowired is just dependency injection. It's not ❌ It's Reflection + Proxies + Runtime Wiring. Which means : ⭕ Dependencies are injected at runtime (not compile time) ⭕ You might be calling a proxy, not your actual class ⭕ Field injection hides dependencies and hurts testability ⭕ Startup time increases as your app grows The biggest surprise : 👉 this.method() can bypass Spring logic completely (broken @Transactional) Lesson : "Convenience annotations often hide real complexity." Do you still use Field Injection in production ? #SpringBoot #Java #BackendEngineering #SoftwareArchitecture

Day 73/100 Logging (Very Important) 📝 Today I focused on something that often gets ignored but is critical in real-world applications — logging. Learned: Why logging is important for debugging and monitoring applications Different log levels and when to use them (INFO, WARN, ERROR) Key takeaway: Logs are not just for debugging, they help understand what’s happening inside the application without stopping it. Starting to realize that good logging is a must for building reliable backend systems. #BackendDevelopment #Java #Logging #LearningInPublic #100DaysOfCode