Java 8 to Java 17 Migration Strategies for Mission-Critical Ecosystems

Custom Compact constructor in Record In this post under Java Record, I will explain with example what is custom compact constructor, what is the use and how to add them in Record. In the previous post under Java Record, I showed what is canonical constructor, what is custom canonical constructor and what is the purpose of it. Below are the points for recap1) For a Record, Java compiler adds a canonical constructor internally…...

One Java concept that helped me understand how objects can be stored and transferred is Serialization & Deserialization. In Java, Serialization is the process of converting an object into a byte stream so it can be saved to a file, stored in a database, or sent over a network. Deserialization is the reverse process converting that byte stream back into a Java object. While learning backend concepts, I realised this is useful in real-world applications when saving object states, transferring data between systems, or sending objects across networks in distributed applications. It helps applications preserve and exchange data efficiently. For me, understanding this concept made it clearer how Java applications manage and move data behind the scenes. 🧠 In Java applications, where have you found serialization to be most useful? #Java #CoreJava #JavaSerialization #BackendDevelopment #JavaDeveloper #SoftwareEngineering #ProgrammingFundamentals

One thing I like about Java is that the biggest progress is often not dramatic enough for social media. There is no single “magic” feature between Java 21 and 25 that changes everything overnight. What you get instead is something more valuable: a better platform. Between Java 21 and 25, Java added: ✅ Scoped Values, ✅ Structured Concurrency, ✅ Foreign Function & Memory API, ✅ Stream Gatherers, ✅ Class-File API, ✅ Compact Object Headers, ✅ Generational Shenandoah, ✅ more startup and profiling work, ✅ better JFR, ✅ and... cleaner syntax with unnamed variables and patterns, module import declarations, and more flexible constructor bodies. That is why I liked Frank Delporte’s video on the move from Java 21 to 25. It looks at Java the way real teams should look at it: not as isolated release notes, but as accumulated engineering progress between LTS versions. Too many people ignore the non-LTS releases and then act surprised when the next LTS contains a lot of change. Worth watching if you want a practical summary without drowning in JEP numbers. ➡️ https://lnkd.in/dnqmDUnj Are you on Java 25 yet?

Thanks, Daniel Witkowski, for sharing this episode of the Friends of OpenJDK (Foojay.io) podcast about the changes between Java 21 and 25. And to Jakob Jenkov, Jonathan Vila López, Ryan Svihla, Mary Grygleski, 👓 Anton Arhipov, Ronald Dehuysser, and Jonathan Ellis, who took the time to share their point of view!

Java has become more intelligent with the introduction and evolution of Pattern Matching. How has it improved? - No more: - ❌ instanceof + casting - ❌ messy switch statements Now you can write: - Clean - Safe - Readable code From Java 16 to 21, pattern matching has evolved into a powerful feature with: - ✅ instanceof patterns - ✅ switch patterns - ✅ record patterns If you are still using old-style Java, you are missing out on significant advancements. I’ve provided practical examples for better understanding. Check the full guide to enhance your Java skills: https://lnkd.in/dsU2tj8w What’s your favorite feature in Java 21

Java has become much less verbose in recent years, especially with the latest LTS release. With the addition of JEP 512, Java 25 no longer requires a class declaration to write a simple script. Additionally, the new java.lang.IO class provides a collection of static methods for convenient, line-oriented access to System.in and System.out. This means we can write a script without:  🔥 a public class wrapper;  🔥 a String[] args array to ignore;  🔥 clunky Scanner objects for basic input. It’s fast to write, easy to read, and executes instantly.

Java Record is NOT a DTO. It’s a Different Way to Think. If you’re using record just to remove getters…you’re using it wrong. What’s really happening here? No getters No casting No instanceof chains This is pattern matching over data shapes. Why records exist Records give the JVM: fixed structure immutability predictable layout Which makes this possible. Where this is going Records are value-based todayand aligned with: Value Classes (Project Valhalla) Meaning: less allocation better memory layout faster execution The shift From: objects with mutable state To: data that can be matched, decomposed, and optimized Record is not a DTO.It’s the foundation of modern Java.

#Java Why does Java not provide default value to local variables? 👉 Answer Java does not give default values to local variables to avoid using uninitialized (garbage) data and ensure safety. 📌 Example class Test { public static void main(String[] args) { int x; System.out.println(x); // ❌ Compile-time error } } ✔ Error: variable x might not have been initialized 📏 Rules (Simple Points) 🔒 Local variables must be initialized before use ❌ No default value is assigned by Java ⚠ Compiler checks this at compile time 📦 Instance & static variables get default values, but local variables do not 🎯 Summary 👉 Java forces initialization to prevent bugs and ensure clean code

🚀 Java Multithreading Simplified Multithreading is one of the most powerful features of Java, allowing applications to execute multiple tasks concurrently — improving performance, responsiveness, and overall efficiency. In modern software systems, multithreading is not just an optimization technique; it is a necessity. From handling thousands of web requests to processing background jobs and real-time data, threads play a crucial role behind the scenes. 🔍 What this covers This infographic provides a quick overview of: 🔹 What multithreading is and how it works 🔹 Why it is essential in modern applications 🔹 The thread lifecycle (New → Runnable → Running → Waiting → Terminated) 🔹 Different ways to create threads in Java (Thread vs Runnable) 🔹 Real-world use cases and key advantages ⚙️ Where multithreading is used • Web servers handling multiple client requests • Background processing (emails, notifications, batch jobs) • Real-time systems and streaming applications • High-performance enterprise applications 🧠 Key takeaway While creating threads in Java is relatively straightforward, managing them efficiently is where real expertise comes in. Concepts like synchronization, thread safety, and resource management are critical to avoid issues such as: • Race conditions • Deadlocks • Thread starvation 🚀 Best practice In production systems, it is recommended to use ExecutorService and thread pools instead of creating threads manually. This approach ensures better control, scalability, and optimal resource utilization. #Java #Multithreading #Concurrency #BackendDevelopment #SoftwareEngineering #SystemDesign #Developers #Programming #LearningJourney

Java Text Blocks, a feature introduced in Java 15, help resolve Sonar issues. However, most developers are not using this feature. It should be adopted and used regularly. https://lnkd.in/gdg2RfeJ