#java21

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KU Kumar Saurav

🚀 Java 26: Every Official Feature Explained with Practical Examples

Java 26 is a non-LTS release that introduces 10 official JEPs focused on language evolution, concurrency, networking, security, and JVM…

Jul 10, 2026 · 2 min read · 0 claps paywalled #java21 #java #technology

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LO Logic Layer | Real Engineering Stories · CodeToDeploy

How Java 21 Virtual Threads Pinned and Deadlocked Our Billing System

We were excited to migrate our billing and transaction gateway to Java 21. The promise was alluring: “virtual threads let you write…

Jul 03, 2026 · 6 min read · 50 claps paywalled #java21 #virtual-threads #deadlock

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AY Ayan Dutta · Javarevisited

Foreign Function & Memory API in Java 21

Call native C from Java — no JNI, no C compiler

Jun 30, 2026 · 8 min read · 36 claps paywalled #java #java-programming #programming

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AY Ayan Dutta · Javarevisited

Generational ZGC in Java 21 Explained

How It Works, Why It Matters, and How It Compares with G1GC and Classic ZGC

Jun 29, 2026 · 15 min read · 45 claps paywalled #java #java21 #java-programming

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AY Ayan Dutta

Java 21 Sequenced Collections: From API Basics to Shopping Cart Examples

A Modern Approach to Learn Java’s Most Elegant Collection Enhancement

Jun 28, 2026 · 16 min read · 15 claps paywalled #java #java-programming #programming

SI Sinan Yazıcı

Java 21 ile Gelen Virtual Threads Neden Önemli?

Java ekosisteminde son yıllarda gelen yenilikler arasında beni en çok meraklandıran konulardan biri Virtual Threads oldu.

Jun 25, 2026 · 1 min read · 51 claps #java #java21 #software-development

SA Samip Gautam

Why Java Needed Virtual Threads

Your Server Isn’t Broken, It’s Just Out of Threads….

Jun 24, 2026 · 2 min read · 0 claps #virtual-threads #concurrency #java21

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AY Ayan Dutta · Javarevisited

See Java 21 String Templates Execute in a Live Spring Boot Application

Follow STR, FMT, and a custom processor from the browser to the Spring Boot service layer — and watch the complete flow in real time

Jun 22, 2026 · 7 min read · 0 claps paywalled #java #spring-boot #programming

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AY Ayan Dutta · Javarevisited

Java 21 String Templates (Preview): How STR & FMT Worked — and Why They Were Withdrawn

A practical look at Java 21’s STR and FMT processors, how the preview syntax worked, and why the feature was withdrawn after Java 22.

Jun 22, 2026 · 9 min read · 0 claps paywalled #java #string-templates #java21

ER Eric Anicet

Automating Business Decisions with Spring Boot and Drools

In this story, we’ll build a loan application decision engine using Spring Boot 3 and Drools 10.2.0. The engine evaluates eligibility…

Jun 22, 2026 · 12 min read · 0 claps paywalled #drools #spring-boot #java21

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AY Ayan Dutta · Dev Genius

Spring Boot Shopping Cart Demo Using Java 21 Sequenced Collections

A practical Java 21 demo showing addFirst(), addLast(), getFirst(), getLast(), removeLast(), and ordered cart behavior through REST APIs…

Jun 19, 2026 · 12 min read · 0 claps paywalled #java #spring-boot #java21

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AY Ayan Dutta · Javarevisited

Migrating a Spring Boot App from Java 17 to Java 21 with OpenRewrite: What It Automates — and What…

A practical hands-on guide to upgrading a real Spring Boot application from Java 17 and Spring Boot 3.1.5 to Java 21 and Spring Boot 3.3…

Jun 19, 2026 · 13 min read · 9 claps paywalled #java #openrewrite #spring-boot

IG Igor Bešlić

OSGi rate limiter inside Liferay DXP — Part 2: the implementation

In part one, a public regulatory platform was being crippled by four to five million anonymous requests a day, and we decided to build a…

Jun 15, 2026 · 7 min read · 3 claps #liferay #osgi #rate-limiting

DI Didem AĞDOĞAN · Softtech

Java Virtual Threads: Milyonlarca Thread Nasıl Mümkün Oldu?

Java 21 ile birlikte Virtual Thread (Sanal İş Parçacığı) artık hayatımızın bir parçası. Aslında önceki sürümlerde preview olarak…

Jun 11, 2026 · 7 min read · 1 claps #java #threads #virtual-threads

IG Igor Bešlić

OSGi rate limiter inside Liferay DXP — Part 1: the incident, and why we built our own

For months, the official story was that we had a JVM memory problem. Nodes in the Liferay DXP cluster kept falling over, the Elasticsearch…

Jun 08, 2026 · 7 min read · 9 claps #liferay #osgi #rate-limiting

SY Syed Nazeer

Record class vs Record Pattern

Records vs Record Patterns in Java, using examples and real-world context.

Jun 01, 2026 · 2 min read · 0 claps #record #record-pattern #java21

CH Chiwa Kantawong (Pea)

Structured Concurrency in Java 21 for Real APIs

Structured Concurrency in Java 21 for Real APIs

May 04, 2026 · 5 min read · 1 claps #structured-concurrency #java21 #spring-boot

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TE Temesgen Dessalegn

How to Unzip and Open a Java Project in IntelliJ IDEA from the Command Line

Overview

Apr 04, 2026 · 3 min read · 0 claps #java21 #intellij-idea #spring-boot

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MI Michael Preston · Javarevisited

How I Tuned G1GC in Java 21 to Eliminate Latency Spikes

A Practical Guide to Garbage Collection Logs, Heap Sizing, and Production JVM Stability

Mar 04, 2026 · 4 min read · 80 claps paywalled #java #g1gc #programming

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AN Andrei Lescu

The Framework Update Recipe — A Practical Roadmap from Chaos to Control

After completing my third Framework Update, I realized it was time to give something back — something practical that could make other…

Feb 17, 2026 · 5 min read · 0 claps #frameworkupdate #sapcommercecloud #openrewrite

KE keylearn · Dev Genius

Spring Boot + JPA + Virtual Threads (Java 21): Avoid N+1, OSIV & Pagination Pitfalls

The Ultimate Production Guide (2026 Edition)

Feb 16, 2026 · 7 min read · 0 claps paywalled #spring-boot #java21 #virtual-threads

ART DSN

KE keylearn · Dev Genius

Java Virtual Threads Are a Bigger Deal Than You Think

Illustration showing Java Virtual Threads vs Platform Threads. Java 21 new features.

Feb 09, 2026 · 3 min read · 0 claps paywalled #java21 #virtual-threads #threads

AA Aastha Bhartia

Upgrading From Java 11 to Java 21 — My Real‑World Journey With a Legacy Application

(It seems easy… until the errors start raining down.)

Feb 08, 2026 · 4 min read · 0 claps #java21 #java11 #legacy-code

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KE keylearn · Dev Genius

Modern Spring Boot with Java 21 — Virtual Threads, ScopedValue, and Structured Concurrency

For years, Java developers had to choose between:

Feb 08, 2026 · 5 min read · 0 claps paywalled #java21 #java-21-features #spring-boot

KE keylearn · Dev Genius

Immutability in Java 21: Records, Defensive Copying, and Collections

If you’ve been writing Java for a while, you probably think you know how to write immutable classes.

Feb 04, 2026 · 2 min read · 4 claps paywalled #immutability #java21 #java-records

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AH Ahmet Emre DEMİRŞEN · @Override

From Java 11 to 21: A Safe and Structured Upgrade Path

Many teams are still comfortably running on Java 11 while being tempted by the modern features, performance improvements, and productivity…

Jan 16, 2026 · 7 min read · 50 claps paywalled #java #java11 #java21

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RA Random Droid

LangChain4j Agent Comparison

A parallel implementation of Market Analyst Agent using LangChain4j, leveraging Java 21 Virtual Threads and Java Records.

Jan 01, 2026 · 5 min read · 6 claps #java-agent #langchain4j #java21

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BH Bharath Kumar

AEM as a Cloud Service 2025.12.0: Quiet Hours, Runtime Readiness, and Guardrails

What changed in the December 2025 AEM as a CS feature release — and how to test and adopt the operational controls and platform guardrails.

Dec 16, 2025 · 3 min read · 1 claps #aem #adobe-experience-manager #adobe-cloud-manager

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SA Salih Eren Birincioğlu

Java 8’den Java 21’e: LTS Sürümler Arasındaki Farklar ve Pratikler

Java ile yolu kesişen herkes şu noktada hemfikirdir: Java eskimez ama değişir. Özellikle Java 8 sonrası, dil yavaş ama kararlı adımlarla…

Dec 15, 2025 · 9 min read · 2 claps #java #backend #java8

BY Byte Coders

#Java 21 — Article 3: Mastering About Sequenced Collections

1) What Are Sequenced Collections?

Dec 13, 2025 · 1 min read · 0 claps paywalled #java21 #java17 #java8

AH Ahmet Emre DEMİRŞEN · @Override

Java OCA & OCP Certification Roadmap: A Complete Study Guide from Beginner to Expert — Part 3

You’ve mastered the fundamentals and built your study plan. Now it’s time to level up with advanced OCP topics that separate good…

Dec 13, 2025 · 18 min read · 66 claps paywalled #java #java21 #ocp

AH Ahmet Emre DEMİRŞEN · @Override

Java OCA & OCP Certification Roadmap: A Complete Study Guide from Beginner to Expert — Part 1

Whether you’re just starting your Java journey or looking to validate your expertise with industry-recognized credentials, Oracle’s Java…

Dec 12, 2025 · 9 min read · 113 claps paywalled #java #oca #ocp

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AR Arda Onur

Java 21 OCP Chapter 8: Lambda ve Fonksiyonel Interface

🔍 Java’da Lambda İfadeleri Nasıl Çalışır?

Dec 08, 2025 · 5 min read · 0 claps #java #java21 #yazilim

BY Byte Coders

#Java 21 — Article 2: Mastering About Virtual Threads.

1)What Are Virtual Threads?

Dec 05, 2025 · 3 min read · 0 claps paywalled #java21 #java17 #java

AR Arda Onur

Java 21 OCP Chapter 7 : Sealed Classes

Java’da sealed class’lar, bir sınıfın hangi alt sınıflar tarafından extend edilebileceğini açıkça belirlememizi sağlar. Böylece kalıtım…

Nov 29, 2025 · 2 min read · 0 claps #java #java21 #yazilim

ART MDA

YI YISUSVII

From Zero to Production: Building a Spring Boot + Kafka + MongoDB Microservice (The Easy Way)

Learn how to set up a modern, event-driven microservice using Spring Boot 3.3, Kafka with Avro, and MongoDB — from scratch to…

Nov 08, 2025 · 6 min read · 0 claps paywalled #spring-boot #confluent-cloud #java21

TCH ECO

IN inside Nikita's Mind

From Java 8 to Java 21: The Ultimate Step-by-Step Migration Guide for 2025

In late 2024, our legacy Java 8 backend was a ticking time bomb — slow startups, outdated security, and compatibility issues with new…

Oct 23, 2025 · 3 min read · 59 claps paywalled #java #software-development #migration-guide

DA Damaso Salgado Cassiani

Record Patterns - Java

Los record apareciendo por primera vez en java 14, esta fue una version previa. Finalmente su version mas madura fue desplegada en java 16.

May 31, 2025 · 2 min read · 4 claps #java #java-14 #java16

IM Imran Khan

Essential Upgrades in Java 15 and above Every Developer Must Know

Here are some of the most impactful enhancements introduced in Java 17 and Java 21, designed to improve code clarity, performance, and…

May 24, 2025 · 4 min read · 34 claps #java #java-tutorial #java17

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BA Balian's Deep Tech

Java 21 ZGC vs G1GC vs Parallel GC: Which One is Best for High-Throughput Apps?

In high-performance Java systems — think real-time APIs, trading engines, e-commerce platforms — GC pauses can be the silent killer of…

Apr 07, 2025 · 3 min read · 65 claps paywalled #java21 #zgc #g1gc

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SI Sivaram Rasathurai · FAUN.dev() 🐾

Java Value Classes → Performance Meets Simplicity From Valhalla

code like a class, work like an int. If you have enough time, watch this talk: https://www.youtube.com/watch?v=Dhn-JgZaBWo

Jan 25, 2025 · 3 min read · 12 claps paywalled #java-value-class #valhalla #java-performance

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SU SumitM

Java New Features: Versions 11 to 23 (Detailed)

Java’s journey from version 11 to version 23 showcases its commitment to keeping up with modern programming trends while enhancing…

Nov 18, 2024 · 3 min read · 19 claps paywalled #java #java21 #java-new-feature

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DE Debashis Kar Suvra

Java 21’s New Era: Unnamed Classes and the End of public static void main(String [] args)

When I began my undergraduate studies, Java was the first programming language I learned. Starting my coding journey with Java, I often…

Jul 13, 2024 · 3 min read · 0 claps #java-21-features #java21 #java

BR Bruno de Souza Picinini

O quão difícil é um Hello World em Java?

Se você já mexeu com java imaginou esse código aqui certo?

Mar 06, 2024 · 2 min read · 5 claps #java #graalvm #java21