Paulo Gombo’s Post

Are you still using @Autowired on fields in your Spring Boot applications? 🤔 It's time to level up your dependency injection game! While field injection is convenient, constructor injection is the superior choice for building robust, testable, and maintainable Spring applications. Here's why: ✅ Immutability: Declare your dependencies as final for thread safety and predictable behavior. ✅ Testability: Easily mock dependencies in unit tests without a full Spring context. ✅ Explicit Dependencies: Your class's requirements are clear right in the constructor. ✅ Fail-Fast: Missing dependencies cause startup failures, preventing runtime NullPointerExceptions. ✅ Refactoring Aid: Compiler catches dependency changes, reducing errors. Making the switch to constructor injection leads to cleaner code and more stable applications. It's a small change with a big impact on your codebase's quality! What are your thoughts on dependency injection best practices? Share in the comments below! #Spring #SpringBoot #Java #DependencyInjection #BestPractices #SoftwareDevelopment #CleanCode #Programming

🧩 I still remember when my Spring Boot API refused to return JSON… I spent hours debugging, only to realize I used the wrong annotation. 😅 That day, I finally understood the difference between 👉 @Controller and @RestController And trust me — this tiny detail can make a big difference. So I turned that learning into a simple visual guide 👇 💡 In this carousel, you’ll learn: ✅ What each annotation actually does ✅ When to use one over the other ✅ And… the BIG question — 👉 What happens if you use both together? Hint: one silently wins the battle 👀 💬 Drop your guess in the comments! And share this if it helped you or your team avoid that “why is my JSON not returning?” moment 😅 #SpringBoot #Java #BackendDevelopment #Microservices #CodeTips #SoftwareEngineering #Developers #LearningInPublic #TechCommunity #Programming #CareerInTech #RestAPI

⚙️ BeanFactory vs ApplicationContext Both BeanFactory and ApplicationContext are Spring containers, but they differ in functionality: 🔹 BeanFactory – The basic container that lazily initializes beans, mainly used for lightweight applications. 🔹 ApplicationContext – A more advanced container that eagerly loads beans and provides additional features like event handling, internationalization, and annotation-based configuration. #SpringFramework #Java #SpringBoot #BeanFactory #ApplicationContext #BackendDevelopment #SoftwareEngineering #Programming #TechLearning #CodeBetter

What's the first "complex" program you remember feeling proud of writing? 🤔 For me, it's been building this full set of Java fundamentals - from checking Prime Numbers to finding if two numbers are an Amicable Pair (like 220 & 284!). Revisiting these core concepts is a great reminder that strong software is built on a foundation of solid, well-understood basics. What's a core programming concept you think every new developer should master? Let me know in the comments! #Java #Developer #Programming #CodingCommunity #TechTalk #SoftwareDevelopment

1 more tutorial + curiosity -> new knowledge unlocked😂🚀 This was my first time setting up, coding, and running a Spring Boot project without any error, and it felt amazing to see it actually work! Before this, I was struggling to find a good Spring Boot course. The ones I came across either lacked proper roadmaps or had lectures with insufficient information. I still remember searching and exploring videos just to know how things actually work on intellij and how I can make spring boot project on it and Fortunately, I found Faisal Memon 100-day series, which is helping me in understanding Spring Boot concepts. Yt Video - https://lnkd.in/gbiWVZKH #Java #SoftwareDevelopment #OOP #Programming #Developer

Recently, I implemented Aspect-Oriented Programming (AOP) in my Spring Boot project to handle cross-cutting concerns like logging. Instead of adding repetitive logging code in every service method, I created a LoggingAspect using @Aspect and @Before advice. Now, I can automatically log method names and class details whenever any service method is called. This not only keeps the code clean and maintainable but also improves debugging and monitoring. 💡 Key Takeaways: AOP helps separate cross-cutting concerns from business logic. @EnableAspectJAutoProxy is crucial to enable AOP in Spring Boot. Proper pointcut syntax is important: even a missing space can prevent the aspect from triggering! Spring Boot + AOP = Powerful combination for clean, scalable, and maintainable code. #SpringBoot#AspectOrientedProgramming #Java #CleanCode #Logging #TechLearning

Ever wondered what happens behind the curtain when Spring injects your dependencies? In the Spring Framework, dependency injection (DI) is not magic, it is a clever use of reflection and object lifecycle management. When your app starts, Spring scans for beans, creates them, and builds a dependency graph. Every dependency is injected at runtime, meaning your classes do not need to create their own objects. Under the hood, Spring uses reflection to instantiate beans, read annotations like `@Autowired`, and call constructors or setters to inject the required objects. These relationships are defined in BeanDefinitions, which act like blueprints that tell Spring exactly how to wire everything together. This mechanism turns your code into a clean, decoupled system where components communicate through well-defined interfaces rather than concrete implementations. The result is easier testing, greater flexibility, and more maintainable architecture. What do you think is the biggest advantage of dependency injection in your projects? #Java #SpringBoot #DependencyInjection #SoftwareEngineering #BackendDevelopment #CleanCode #DesignPatterns #Programming

Writing clean, maintainable, and scalable code is essential for every developer. In this article, I explain the SOLID principles — from Single Responsibility to Dependency Inversion — with clear Java and Spring Boot examples showing how to apply them in real-world projects. This article highlights how SOLID helps you: Write cleaner, testable code Reduce technical debt Build flexible and robust architectures The full article is attached below in PDF format. #Java #SpringBoot #SOLID #CleanCode #SoftwareEngineering #Programming #BestPractices

🚀 Runnable vs Callable — The Threading Showdown You Didn’t Know You Needed! Ever wondered why Java gave us both Runnable and Callable? Let’s simplify 👇 1. Runnable came first — old school, reliable. 2. Callable came later — smarter, more flexible. 3. Runnable’s run() → does the job, returns nothing. 4. Callable’s call() → does the job and gives you something back 💡 5. Runnable says: “I’ll just run.” 6. Callable says: “I’ll run, and I’ve got results for you!” 💼 7. Runnable can’t throw checked exceptions ❌ 8. Callable can ✅ 9. Use Runnable when you just want action. 10. Use Callable when you want answers. 11. Runnable = Fire & Forget 🔥 12. Callable = Fire & Collect 🎯 13. ExecutorService.submit(Callable) → gives you a Future. 14. Future = the promise of a result, not now, but soon ⏳ 15. Runnable walks… 16. Callable runs 🏃♂️💨 Next time you build a multithreaded app, choose wisely — and code like a pro ⚙️✨ 💾 Save this post for your next concurrency project 🤝 Follow for more Java insights #Java #Coding #Multithreading #Developers #TechTips #Programming #CodeBetter