https://foojay.io/Foojay is a place for Friends Of OpenJDK, providing free, reference materials and blogs for daily Java usage.Hugoen-usFri, 30 Oct 2026 00:00:00 +0000https://foojay.io/today/rewrite-everything-in-java-not-rust/Fri, 30 Oct 2026 00:00:00 +0000Shai AlmogJavahttps://foojay.io/today/rewrite-everything-in-java-not-rust/A Java word processor built with Codename One beats its Rust twin on startup, typing latency, memory, binary size, code size and CI time, and also runs on iPhone, Android and the web.https://foojay.io/today/openid-federation-with-pac4j-and-cas/Fri, 30 Oct 2026 00:00:00 +0000Jérôme LELEUJavaSecurityTutorialshttps://foojay.io/today/openid-federation-with-pac4j-and-cas/Build an OpenID Federation with pac4j as the Java relying party and Apereo CAS as both OpenID Provider and trust anchor.https://foojay.io/today/ide-for-coding-agents-netbeans-mcp/Fri, 30 Oct 2026 00:00:00 +0000Anton EppleNetBeansAIDeveloper Toolshttps://foojay.io/today/ide-for-coding-agents-netbeans-mcp/Coding agents rename methods with grep and edit loops. A headless Apache NetBeans gives them real refactorings over MCP, with fewer turns and tokens.https://foojay.io/today/maven-build-cache-in-practice/Thu, 29 Oct 2026 00:00:00 +0000Maarten MuldersKasper van de WeteringMavenUse Caseshttps://foojay.io/today/maven-build-cache-in-practice/The Maven Build Cache significantly reduces build times in enterprise projects. Learn how we introduced it in Azure DevOps pipelines, the issues we encountered, and the valuable lessons we learned along the way.https://foojay.io/today/how-we-share-foojay-posts-on-social-media/Thu, 29 Oct 2026 00:00:00 +0000Frank DelporteFoojayDeveloper ToolsAIJBanghttps://foojay.io/today/how-we-share-foojay-posts-on-social-media/Every new Foojay article is announced on Mastodon, Bluesky and LinkedIn by one small JBang script. How it works and which problems we had to solve.https://foojay.io/today/jvm-on-unikernel-nanos-gc-trade-offs-and-heap-uncommit/Wed, 28 Oct 2026 00:00:00 +0000Angelo RubiniJavaOpenJDKPerformancehttps://foojay.io/today/jvm-on-unikernel-nanos-gc-trade-offs-and-heap-uncommit/Testing five HotSpot garbage collectors and heap uncommit on Nanos, revisiting the Akamas study with Eclipse Temurin 25 and Renaissance.https://foojay.io/today/free-java-real-risk-why-unsupported-openjdk-is-now-a-security-gamble/Wed, 28 Oct 2026 00:00:00 +0000Simon RitterJavaSecurityhttps://foojay.io/today/free-java-real-risk-why-unsupported-openjdk-is-now-a-security-gamble/Learn why unsupported OpenJDK is a security risk in the age of AI.https://foojay.io/today/announcing-vitra-modern-ui-library-for-javafx/Wed, 28 Oct 2026 00:00:00 +0000Libán Bande GonzálezJavaFXLibraryDesktophttps://foojay.io/today/announcing-vitra-modern-ui-library-for-javafx/Vitra is a carefully crafted UI library that brings modern controls, Fluent-inspired materials and professional surfaces to JavaFX applications.https://foojay.io/today/what-jstack-misses-when-your-java-service-uses-virtual-threads/Tue, 27 Oct 2026 00:00:00 +0000Felipe MaschioJavaJava CoreDebugginghttps://foojay.io/today/what-jstack-misses-when-your-java-service-uses-virtual-threads/A service with virtual threads can have thousands of requests waiting while jstack shows idle carriers. How to read Thread.dump_to_file instead, JDK 21 to 25.https://foojay.io/today/java-new-features-in-production/Tue, 27 Oct 2026 00:00:00 +0000Mikhail PolivakhaJavaSealed Classeshttps://foojay.io/today/java-new-features-in-production/See how Axelix uses Java ScopedValue to propagate security context and sealed interfaces to protect domain invariants in real-world production code.https://foojay.io/today/duckdb-2-0-is-here/Tue, 27 Oct 2026 00:00:00 +0000Geertjan WielengaDatabasesJavahttps://foojay.io/today/duckdb-2-0-is-here/DuckDB 2.0.0 LTS - Cinnamon Teal - is the project's biggest release yet, with a server mode, async I/O, first-class VARIANT support and a new parser.https://foojay.io/today/java-champions-github-copilot/Mon, 26 Oct 2026 00:00:00 +0000Julien DuboisJavaDeveloper Toolshttps://foojay.io/today/java-champions-github-copilot/Three Java Champions share practical GitHub Copilot workflows, from feature development to agentic verification and debugging Pi4J.https://foojay.io/today/arcana-pure-java-archive-library/Mon, 26 Oct 2026 00:00:00 +0000Stéphane BuryJavaLibraryToolshttps://foojay.io/today/arcana-pure-java-archive-library/Arcana extracts ZIP, 7z, RAR 5, zstd, MSI, ISO, DMG and 40+ formats in pure Java 8: no native code, no dependencies, one JAR on Maven Central.https://foojay.io/today/sheetmusic4j-0-0-5-lilypond-import-and-export/Sun, 25 Oct 2026 00:00:00 +0000Frank DelporteJavaFXJavahttps://foojay.io/today/sheetmusic4j-0-0-5-lilypond-import-and-export/Sheetmusic4J 0.0.5 can read and write LilyPond files through the ScoreFile facade, and brings engraving improvements like tuplet placement and octave clefs.https://foojay.io/today/pi4j-drivers-v1-2-0-epaper-dac-adc-motors-and-lora/Sun, 25 Oct 2026 00:00:00 +0000Frank DelportePi4JRaspberry PiJavaEmbeddedhttps://foojay.io/today/pi4j-drivers-v1-2-0-epaper-dac-adc-motors-and-lora/Pi4J Drivers V1.2.0 adds ePaper displays with partial updates, new DAC and ADC drivers, motor and servo controllers, and a LoRa transceiver driver for Java on the Raspberry Pi.https://foojay.io/today/jcast-roundup-summer-2026/Sat, 24 Oct 2026 00:00:00 +0000Oumaima ZeroualiPodcastJavaAICloudInterviewshttps://foojay.io/today/jcast-roundup-summer-2026/Six new JCast episodes from June to October 2026: AI hype and agents, clean code, cloud costs, Quarkus with Kevin Dubois, and meeting-heavy days.https://foojay.io/today/create-an-uber-clone-in-1-minute/Sat, 24 Oct 2026 00:00:00 +0000Shai AlmogJavaCodename Onehttps://foojay.io/today/create-an-uber-clone-in-1-minute/Own a full-stack Java ride-hailing application: rider, driver and admin apps, payments, live tracking and push.https://foojay.io/today/owasp-java-security-libraries-please-update/Fri, 23 Oct 2026 00:00:00 +0000Jim ManicoJavaSecurityhttps://foojay.io/today/owasp-java-security-libraries-please-update/Fresh releases of OWASP Java Encoder and Java HTML Sanitizer: what changed, how to use them, and what to check when upgrading.https://foojay.io/today/how-to-secure-a-spring-boot-application-with-openid-connect-and-pac4j/Fri, 23 Oct 2026 00:00:00 +0000Jérôme LELEUJavaSpringSecurityTutorialshttps://foojay.io/today/how-to-secure-a-spring-boot-application-with-openid-connect-and-pac4j/Add OpenID Connect login to Spring Boot with pac4j: Maven setup, provider configuration, user profiles and logout.https://foojay.io/today/azul-zulu-october-2026-quarterly-update-and-out-of-cycle-release/Fri, 23 Oct 2026 00:00:00 +0000Frank DelporteJavaJava CoreRelease Noteshttps://foojay.io/today/azul-zulu-october-2026-quarterly-update-and-out-of-cycle-release/A record 53 CVEs fixed in the October 2026 quarterly update for Azul Zulu, overtaken within a day by a zero-day: compromised eMudhra CA keys and an out-of-cycle release.https://foojay.io/today/exact-prices-in-java/Thu, 22 Oct 2026 00:00:00 +0000Christian LauridsenJavaJava Corehttps://foojay.io/today/exact-prices-in-java/Why double breaks prices, why APIs send them as strings, and the BigDecimal and Jackson traps to avoid when you read, compute and display them.https://foojay.io/today/android-apps-beyond-android/Thu, 22 Oct 2026 00:00:00 +0000Shai AlmogJavaCodename Onehttps://foojay.io/today/android-apps-beyond-android/Compile Android apps for iOS, web and desktop with a free, open-source compatibility layer. Try the browser demo, see the iOS binary size and migrate one...https://foojay.io/today/java-stream-gatherers/Wed, 21 Oct 2026 00:00:00 +0000Mahendra Rao BJavaTutorialsIntelliJhttps://foojay.io/today/java-stream-gatherers/Explore Java Stream Gatherers (JEP 485) from practical built-in patterns like windowing and concurrent mapping to authoring your own custom stateful pipeline components.https://foojay.io/today/bxplaywright-10-real-browsers-fluent-boxlang-built-for-ai-agents/Wed, 21 Oct 2026 00:00:00 +0000Luis MajanoBoxLangJavaTestingAIDeveloper Toolshttps://foojay.io/today/bxplaywright-10-real-browsers-fluent-boxlang-built-for-ai-agents/BxPlaywright 1.0 brings fluent browser automation, real-browser testing, Playwright MCP, accessibility checks, rendering, and AI-agent tooling to BoxLang.https://foojay.io/today/boxlang-1-18-0-released-every-cloud-every-node-every-agent/Wed, 21 Oct 2026 00:00:00 +0000Luis MajanoBoxLangJavaCloudAIhttps://foojay.io/today/boxlang-1-18-0-released-every-cloud-every-node-every-agent/BoxLang 1.18.0 adds Azure Functions, cluster-safe scheduled tasks, a more automation-friendly CLI, and refreshed docs for developers and AI agents.https://foojay.io/today/upgrading-java-21-to-25-what-actually-breaks/Tue, 20 Oct 2026 00:00:00 +0000Gerard Marimon CaparrósJavaOpenJDK MigrationJEPshttps://foojay.io/today/upgrading-java-21-to-25-what-actually-breaks/Seven changes between Java 21 and 25 that break builds, startup or behaviour, each reproduced on both JDKs, and how to find them before you upgrade.https://foojay.io/today/foojay-podcast-103/Mon, 19 Oct 2026 00:00:00 +0000Dmitry MoskalyukFrank DelporteShai AlmogJavaKotlinPerformancePodcastCodename Onehttps://foojay.io/today/foojay-podcast-103/A backend data layer and a cross-platform UI framework both moved reflection to build time. Dmitry Moskalyuk and Shai Almog explain why, and what it costs.https://foojay.io/today/lottie4j-1-2-7-a-performance-release/Sun, 18 Oct 2026 00:00:00 +0000Frank DelporteJavaFXhttps://foojay.io/today/lottie4j-1-2-7-a-performance-release/Lottie4J 1.2.7 focuses on performance: image assets are decoded once and cached, track mattes reuse their buffers between frames, and GC pauses drop by two thirds.https://foojay.io/today/pi4j-v5-work-in-progress/Sat, 17 Oct 2026 00:00:00 +0000Frank DelportePi4JRaspberry PiEmbeddedhttps://foojay.io/today/pi4j-v5-work-in-progress/What is changing towards Pi4J V5.0.0: a big API cleanup, a simpler Context, parallel ports, RISC-V support, better board detection, and a new release flow.https://foojay.io/today/build-your-first-saas-with-mongodb-ephemeral-clusters/Fri, 16 Oct 2026 00:00:00 +0000Tim KellyMongoJavaSpringTutorialshttps://foojay.io/today/build-your-first-saas-with-mongodb-ephemeral-clusters/Provision a MongoDB Atlas Ephemeral Cluster with one API call, then have an AI coding agent build a full-stack Spring Boot and React job tracker on it.