Tag: #java

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• The Generational Shift in Languages and Runtimes — Eleven Projects Read Through Their Official EOL Notices

  Eleven languages, frameworks and runtimes with official end-of-life notices on record. Python 2, AngularJS, Vue 2, Nashorn, Java applets and Web Start, Mono, Xamarin, PhoneGap, Atom, io.js and jQuery Mobile, each split i

  2026-08-12 · 10 min read #open-source#javascript#java#python#framework

• What Java Value Objects (JEP 401) Change — What You Gain and Lose by Giving Up Identity

  At 00:45 UTC on July 31, 2026, the JEP 401 Value Objects implementation merged into the OpenJDK mainline. Bundled into a single commit with JEP 539 (Strict Field Initialization), it added roughly 208,000 lines across 1,8

  2026-07-31 · 16 min read #java#jvm#valhalla#jep-401#performance

• The Final Field Mutation Warning in JDK 26 — What JEP 500 Actually Changed, and What to Check Now

  JDK 26 (GA on March 17, 2026) started emitting a runtime warning, via JEP 500 "Prepare to Make Final Mean Final," for code that reassigns final fields through deep reflection. Ever since JDK 5, Field.set() after setAcces

  2026-07-16 · 17 min read #java#jvm#reflection#serialization#migration

• Keycloak SPI Extension Development — From Custom Authenticators to EventListeners

  A complete guide to developing Keycloak SPI (Service Provider Interface) extensions. We cover the Provider/ProviderFactory architecture, a full internal SMS OTP Authenticator implementation, a Kafka audit-log EventListen

  2026-06-12 · 13 min read #keycloak#spi#java#security#devops

• Keycloak + Spring Security 6 Integration — Resource Server and OAuth2 Client in Practice

  A practical guide to integrating Keycloak with Spring Security 6 as an OAuth2 Resource Server and Client. Covers issuer-uri auto-configuration, mapping realm and client roles with JwtAuthenticationConverter, OIDC logout,

  2026-06-12 · 11 min read #keycloak#spring-security#oauth2#oidc#jwt

• Modern Java 2026 — Java 25 LTS / Spring Boot 3.5 / Quarkus / Virtual Threads / GraalVM 25 / Loom / Panama Deep Dive

  A full state-of-the-ecosystem tour of Modern Java in 2026 — Java 25 LTS (Sept 2025) with virtual threads as the default, pattern matching finalized, Spring Boot 3.5 native integration, Quarkus 3.20, Micronaut 4, Helidon

  2026-05-16 · 18 min read #java#jvm#java-25#spring-boot#quarkus

• Lock-Free Concurrency Programming Complete Guide 2025: Atomics, Memory Model, CAS, Lock-Free Data Structures

  Everything about Lock-Free programming: atomics fundamentals, CPU memory models (x86 vs ARM), CAS (Compare-And-Swap), Lock-Free data structures (Queue/Stack/Hash), ABA problem, Hazard Pointers, RCU, Java/Rust/C++ compari

  2026-04-15 · 11 min read #lock-free#concurrency#atomics#memory-model#cas

• Spring Boot 3.x Complete Guide 2025: Virtual Threads, GraalVM Native, Spring AI

  Everything about Spring Boot 3.x! Java 21 Virtual Threads, GraalVM Native Image, Spring AI, Security 6, Testcontainers, Observability complete guide.

  2026-03-23 · 19 min read #spring-boot#java#virtual-threads#graalvm#spring-ai

• Java Testing Complete Guide: JUnit 5, Mockito & WireMock in Practice

  A comprehensive guide to Java testing with JUnit 5, Mockito, WireMock, TestContainers, and ArchUnit. Covers TDD from scratch, Spring Boot Test layers, and integration testing strategies.

  2026-03-17 · 16 min read #java#junit5#mockito#wiremock#tdd

• Modern Java Complete Syntax Guide: Java 17/21 Edition

  A comprehensive guide to modern Java syntax based on Java 21 LTS, covering Records, Sealed Classes, Pattern Matching, Virtual Threads, Stream API, Generics, and Concurrency.

  2026-03-17 · 19 min read #java#자바#java17#java21#문법

• Spring Boot Authentication Practical Guide — Session, JWT, SecurityContext, Cookie-Based Auth Complete Mastery

  Master how to implement session and JWT-based authentication in Spring Boot, from SecurityFilterChain and custom filters to SecurityContext and cookie configuration, with practical code examples.

  2026-03-08 · 14 min read #architecture#authentication#spring-boot#jwt#cookie

• Analyzing Java Processes with Async Profiler

  Analyzing Java Processes with Async Profiler

  2023-06-19 · 3 min read #java#profiler

• HBase 3.0 Install on Ubuntu (Non Secure)

  Learn how to install HBase 3.0 (Non Secure) version on Ubuntu.

  2022-12-25 · 2 min read #hbase#java

• Hadoop 3.4 Install on Ubuntu(Non Secure)

  Learn how to install Hadoop 3.4 (Non Secure) version on Ubuntu.

  2022-12-25 · 3 min read #hadoop#java

• Apache Phoenix Installation Guide

  Learn how to install Apache Phoenix

  2022-12-18 · 2 min read #hbase#phoenix#java

• Redis DB Installation Guide on Ubuntu

  Learn how to install Redis DB on Ubuntu.

  2022-12-14 · 2 min read #java#jvm

• How to Fix Hadoop-Client NoClassDefFoundError (IntelliJ)

  How to fix Hadoop-Client NoClassDefFoundError

  2022-10-03 · 1 min read #hadoop#java

• Java Hadoop Client Usage Guide

  How to use the Java Hadoop Client

  2022-10-03 · 3 min read #hadoop#java

• HBase Client API Basics

  Learn the basics of the HBase Client API used to interact with HBase.

  2022-09-26 · 2 min read #hbase#api#java