RajKumar Prasad’s Post

Spring Boot Magic ✨ — DevTools Tired of restarting your Spring Boot app again and again after every small change? 😅 That’s where DevTools comes in 👇 👉 Automatic restart on code changes 👉 Live reload in browser 👉 No need to manually rebuild every time 👉 Faster development experience 💡 How to use it? Add dependency: spring-boot-devtools Run your app Just save changes… and it auto-restarts 🚀 No extra setup, no complex config — it just works. Once you start using DevTools, going back to manual restarts feels painful 😄 #SpringBoot #Java #DevTools #BackendDevelopment #DeveloperLife

Do you also think building apps is complicated? Setting up everything… connecting pieces… making it all work together. But what if you could just focus on your idea? That’s what Spring Boot does. It takes care of the heavy lifting in the background, so you can build faster, with less stress - and actually enjoy the process. Think less setup. More building. 🚀 #SpringBoot #Java #BackendDevelopment #SoftwareEngineering #CleanCode #DeveloperLife

🚀 How a Spring Boot Application Starts It looks simple… but a lot happens behind the scenes 👇 1️⃣ Main method runs 2️⃣ SpringApplication boots up 3️⃣ ApplicationContext is created 4️⃣ Components are scanned 5️⃣ Auto-configuration kicks in 6️⃣ Beans are initialized 7️⃣ Embedded server starts 💡 And just like that—your app is ready to serve requests! Understanding this flow helps you debug faster and build better systems. #SpringBoot #Java #BackendDevelopment #Microservices #SoftwareEngineering #DevOps

Spring Boot Actuator — Your production best friend 🚀 Want to monitor your app in real-time? Use Actuator 👇 Add dependency: spring-boot-starter-actuator Now you get: 👉 /actuator/health 👉 /actuator/metrics 👉 /actuator/beans 👉 /actuator/env 💡 Why it’s powerful: ✔ Monitor app health ✔ Track performance ✔ Debug issues faster ⚠️ Important: Secure actuator endpoints in production 🔐 👉 Never expose everything publicly Real backend engineers monitor systems, not just build them 💯 #SpringBoot #Java #Monitoring

You didn't write 90% of your last release 🤖 Open-source made modern software possible. It also created our biggest blind spot. Every library you add brings its own dependencies. Those bring theirs. And so on. At some point, your application is running millions of lines of code from hundreds of maintainers you've never reviewed. → Some haven't pushed a commit in years → Some have known CVEs sitting open → Some will be abandoned next quarter But your CI is green, so it feels fine 🟥 🟩 That’s the problem we’ve been researching for the past 4 years. So we built DepTools → Map your full dependency graph → Understand quality, maintenance, and risk → Get a clear health score + actionable insights Now open to the public Supports Maven and Gradle projects (for now). 👉 https://deptools.io What does your dependency graph actually look like? #softwaresupplychain #softwaredependencies #softwareengineering #java

Very nice work by Damien Jaime, that I had the pleasure to co-advise during his PhD, and a colleague of his. Dependencies everywhere today. With the recent attacks on the software supply chain, it is important to assess one's dependencies and have help in evolving them.

🚀 Day 17/100: Spring Boot From Zero to Production Topic: Activating Profiles in Spring Boot -> Why Activation Matters Creating profiles isn’t enough You need to activate them to use their config Otherwise, Spring Boot falls back to the default profile. -> Method 1: JVM Argument Pass this when running your app: -Dspring.profiles.active=dev Common for: Local development Switching configs quickly Loads application-dev.yaml -> Method 2: Environment Variable Set: SPRING_PROFILES_ACTIVE=dev Best for: Production environments CI/CD pipelines -> Default Behavior No active profile? default gets loaded Others are ignored Quick Insight Profiles = Config separation Activation = Making them work Simple concept. Powerful impact. This might sound simple but stay consistent. We’re building production mindset step by step. #Java #SpringBoot #SoftwareDevelopment #100DaysOfCode #Backend

🚀 Day 10 — Spring Boot Introduction (Game Changer 🔥) After learning Spring basics, today I started Spring Boot 🚀 And honestly… it solved many problems 👇 ❗ Problem in Spring: Too much configuration 😓 Need to setup server manually Takes more time to start 💡 Solution → Spring Boot Spring Boot is built on Spring that makes development: 👉 Faster 👉 Simpler 👉 Ready to run ⚡ Key Features: 🔹 Auto Configuration 👉 Spring Boot automatically configures your app (no need to write everything manually) 🔹 Starter Dependencies 👉 Pre-defined dependencies Example: spring-boot-starter-web spring-boot-starter-data-jpa 👉 No need to add multiple dependencies 🔹 Embedded Server 👉 No need to install Tomcat 👉 App runs using main method 📌 Simple Understanding: 👉 Spring = Powerful but complex 👉 Spring Boot = Same power + less setup 🚀 💡 One line I learned: 👉 Spring Boot = Spring made easy 💬 Did you start Spring Boot or still learning Spring? Day 10 done ✅ #SpringBoot #Java #BackendDevelopment #LearningInPublic #30DaysOfCode #Developers

🚨 Ever wondered what actually happens when a Spring Boot app starts? Most developers just run the app and move on. But understanding this helped me debug startup issues faster. Here’s the simplified flow 👇 Spring Boot initializes the ApplicationContext Auto-configuration kicks in (based on classpath) Beans are created and wired Embedded server (Tomcat) starts Application is ready to serve requests 💥 Real issue I faced: A misconfigured bean was slowing startup by ~20 seconds. Root cause? Unnecessary component scanning + heavy initialization logic inside a bean. ✅ Fix: Reduced scan scope Moved heavy logic to lazy initialization 💡 Takeaway: Startup time matters more than you think in microservices. Have you ever debugged a slow Spring Boot startup? #Java #SpringBoot #BackendDevelopment #SoftwareEngineering  #Microservices #RESTAPI #SystemDesign  #DeveloperLife #100DaysOfCode

🚀 Day 11 of My Spring Boot Learning Journey Today, I started learning about REST APIs in Spring Boot. A REST API (Representational State Transfer) allows different systems to communicate over HTTP using standard methods like GET, POST, PUT, and DELETE. In Spring Boot, we can easily create REST APIs using annotations like @RestController and @RequestMapping. 💡 Basic Flow of REST API: ✔ Client sends request (browser/Postman) ✔ Controller handles the request ✔ Service processes business logic ✔ Response is returned in JSON format REST APIs are widely used in web and mobile applications to connect frontend and backend systems. This is one of the most important concepts for backend developers. #SpringBoot #Java #RESTAPI #BackendDevelopment #Programming #LearningJourney