Java Bean Bag

🔥 Top 20 Java Coding Standards vs Anti-Patterns — With Real Examples & Fixes! Welcome to a no-nonsense, funny, and deeply educational guide that’ll help you avoid bugs, write cleaner code, and ace interviews. Let’s roll! 🎯 🎯 1. Avoid Wildcard Imports (import.*) ✅ Best: import java.util.List; import java.util.ArrayList; ❌ Worst: import java.util.*; 💥 What goes wrong: - Conflicting classes (like java.util.Date vs java.sql.Date) - IDE slows down due to unnecessary type loading - Harder for humans to read 😂 "I use * because I believe in surprises!" — Future you debugging a Date conflict ⚡ 2. Fail Fast Design if (user == null) throw new IllegalArgumentException("User can't be null"); user.getName(); // Boom! NPE gift 🎁 🧠 Catch bugs early, easier to debug. 🛡️ 3. Immutable DTOs public record UserDTO(String name, int age) {} public class UserDTO { public String name; public int age; } ...

  ☕ Have you ever had a Java application just... vanish ? No stack trace. No clear error. Just a core dump or a mysterious hs_err_pid file left behind like a clue from a crime scene. Over the past few weeks, I’ve been wrestling with this. 🧠 I kept asking myself: What really causes a JVM crash ? Is it always the app’s fault? How can I truly diagnose and prevent it? And how do I make sense of that gigantic heap dump file? So I went deep into the internals. Here’s what I found 👇 🔍 Why JVM Crashes (Beyond Just “OOM”) Yes, we all know about OutOfMemoryErrors. But JVM crashes often involve subtle, deeper issues: 🧬 Native Code Issues – JNI calls from Java to C/C++ can corrupt memory if not handled properly 🕸️ Threading Chaos – Deadlocks, race conditions, or blocked critical threads can destabilize the runtime 🗂️ DirectByteBuffer Abuse – Memory allocated outside the heap can escape GC tracking 🧱 Corrupt JVM Installation – Misconfigured JDKs, mixed versions, or...

 There’s one thing I truly believe… If I can become a Java developer, then anyone in the world can. 💯 Sounds crazy? Let me take you back. 🕓 Back in 2015… I had zero coding knowledge . Not just that — I had no interest in coding either. But life has its own plans. In 2016, I got a chance to move to Bangalore and joined a Java course at a training center. That’s where it all started — Every day, every session made me feel like: "Ohhh! Even I can be a developer!" That course didn’t just teach Java — it gave me confidence . 🧪 Two Life-Changing Incidents 1️⃣ The Interview That Wasn't Planned Halfway through my course, I had to urgently travel to Chennai to donate blood to a family member. After that emotional rollercoaster, I found myself reflecting on my skills and the future. The next day, as I was preparing for my move to Bangalore to complete the remaining four months of my course, I randomly thought — "Let me test my skills... let me just see...