Otavio Santana’s Post

JVM is the core engine that executes Java bytecode, providing platform independence. JRE bundles the JVM and essential libraries, enabling the execution of Java applications. JDK encompasses the JRE and additional development tools, providing a complete environment for both developing and running Java applications.

Java’s Journey: From Java 8 to Java 21 — A Decade of Powerful Enhancements As engineers, we’ve seen Java evolve rapidly over the past few years. Each LTS release has introduced features that make our applications more scalable, expressive, and developer-friendly. Here’s a quick snapshot of this evolution: Java 8 (2014): • Lambda expressions • Stream API • Functional interfaces • Default & static methods • Date & Time API Java 11 (2018): • var keyword • HTTP Client API • String enhancements • Files.readString()/writeString() • Removal of Java EE & CORBA modules Java 17 (2021): • Sealed classes • Records • Text blocks • Pattern matching for instanceof Java 21 (2023): • Virtual threads (Project Loom) • Record patterns • Sequenced collections • Scoped values Java continues to innovate at an impressive pace — enabling cleaner code, better performance, and modern concurrency models. If your applications still rely on older versions, this might be the right time to evaluate an upgrade. Modern Java isn’t just faster — it’s more expressive, lightweight, and developer-centric. #Java #Java8 #Java11 #Java17 #Java21 #SoftwareEngineering #BackendDevelopment #Programming #Tech

Java 25 instance main method Limitations: - Cannot access static members directly (no static context). - Does not support command-line arguments (String[] args). - Allowed only in classless (compact) source files. - Not valid inside explicitly declared classes. - Only one main() method per file. - No package or import statements allowed. - Implicit class is final and cannot be extended. - Cannot use access modifiers like public or private. - Not suitable for large or modular applications. #Java #java25 #developers #developerscommunity #developer

This image explains the Java program execution process in simple steps. First, the source code (HelloWorld.java) is written by the developer. The Java compiler then converts this code into bytecode (HelloWorld.class), which is platform-independent. The bytecode is executed by the Java Virtual Machine (JVM), which translates it into machine code for the specific device. Finally, the program runs on the computer, demonstrating Java’s "write once, run anywhere" capability, ensuring portability across different systems.

Are your enterprise applications still running on older versions of Java and Spring Boot? With Java 8 and Spring Boot 1.x/2.x reaching end of life, challenges around performance, security, and scalability are only increasing. Our perspective paper explores how iRenew’s semi-automated approach helps enterprises modernize these applications, improving performance, reducing technical debt, and accelerating time to market. With net efficiency gains of 11%–20% across discovery, refactoring, and testing, iRenew makes modernization faster and smarter. Explore our latest perspective paper playbook on the application modernization journey, including key phases, measurable benefits, and a real-world case study. https://lnkd.in/gw5vnfRf #IrisSoftware #PerspectivePaper #Java #SpringBoot #iRenew

Modernization is no longer a choice — it’s a catalyst for transformation. Across industries — especially insurance — legacy platforms built on older Java and Spring Boot versions are slowing innovation and exposing enterprises to security and scalability risks. At Iris Software, we’re helping organizations modernize smarter with iRenew, our semi-automated modernization framework that: ⚙️ Accelerates discovery, refactoring, and testing 📉 Reduces technical debt and operational risk 🚀 Delivers 11–20% efficiency gains across modernization phases This isn’t just about technology upgrades — it’s about building the agility to launch new products faster, personalize customer experiences, and stay competitive in a digital-first world.

The JCP demonstrates that open source is not just about publishing code; it’s also a collaborative methodology, ensuring that even after 30 years, Java continues to evolve with the same spirit of openness that made it thrive. Read more 👉 https://lttr.ai/AkChC #java #future #jcp

💡 Understanding Call by Value vs Call by Reference in Java 🔹 Call by Value: A copy of the actual value is passed to the method. Changes made inside the method don’t affect the original variable. Example: void modify(int x) { x = 50; } Here, changing x inside the method won’t change the original variable’s value. 🔹 Call by Reference (Conceptual): Instead of passing the value, the reference (address) of the variable is passed. Any change made affects the original object. Example: void modify(int[] arr) {   arr[0] = 50; } Since the array’s reference is passed, modifying it changes the original array. 🔸 Call by Value → Works on Copies 🔸 Call by Reference → Works on Original Data #Java #Callbyvaluevscallbyrefernce #LearningJourney

𝗨𝗻𝗹𝗼𝗰𝗸𝗶𝗻𝗴 𝗖𝗼𝗻𝗰𝘂𝗿𝗿𝗲𝗻𝗰𝘆 𝘄𝗶𝘁𝗵 𝗩𝗶𝗿𝘁𝘂𝗮𝗹 𝗧𝗵𝗿𝗲𝗮𝗱𝘀 𝗶𝗻 𝗝𝗮𝘃𝗮 Virtual Threads are changing the way we handle concurrency in Java — making applications more scalable, lightweight, and efficient. For developers, understanding them helps in: • Simplifying thread management and improving performance • Building high-concurrency systems without complex thread pooling • Enhancing scalability in modern Java applications This article breaks down 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗟𝗼𝗼𝗺 and how 𝗩𝗶𝗿𝘁𝘂𝗮𝗹 𝗧𝗵𝗿𝗲𝗮𝗱𝘀 reshape Java’s concurrency model with practical insights and examples. https://lnkd.in/gMC-G6xy

Java Performance Tuning Make your Java applications run faster, smoother, and smarter with performance tuning! ⚡ 🔹 Focus Areas: ✅ JVM Optimization ✅ Garbage Collection Strategies ✅ Application Profiling 💡 Unlock the full potential of your Java apps through smart performance engineering. #Java #PerformanceTuning #JVM #GarbageCollection #Profiling #AdvancedJava #Optimization #TechInnovation