https://foojay.io/Foojay is a place for Friends Of OpenJDK, providing free, reference materials and blogs for daily Java usage.Hugoen-usFri, 02 Oct 2026 00:00:00 +0000https://foojay.io/today/changes-included-in-release-26-08-of-azul-zing-builds-of-openjdk/Fri, 02 Oct 2026 00:00:00 +0000Matt Van OrderJavaRelease Noteshttps://foojay.io/today/changes-included-in-release-26-08-of-azul-zing-builds-of-openjdk/Azul Zing Builds of OpenJDK, the optimized Java runtime within Azul Platform Prime, has reached the release of the 26.08 Stable Release line.https://foojay.io/today/why-every-jvm-in-your-fleet-warms-up-alone/Thu, 01 Oct 2026 00:00:00 +0000Jiří HolušaJava CorePerformanceJEPshttps://foojay.io/today/why-every-jvm-in-your-fleet-warms-up-alone/Why you can't just copy a JIT-compiled method from one JVM to another: compiled code is a bet on one specific JVM's state. Identity, validity, and profitability all have to be checked before it's safe to reuse.https://foojay.io/today/lathe-a-java-language-server-from-your-maven-build/Thu, 01 Oct 2026 00:00:00 +0000Alexey GavrilovDeveloper ToolsJavaMavenhttps://foojay.io/today/lathe-a-java-language-server-from-your-maven-build/No project import, no classpath setup — Lathe takes its whole model from your Maven build, so the editor never drifts from what actually compiles.https://foojay.io/today/announcing-skinning-javafx-applications/Thu, 01 Oct 2026 00:00:00 +0000Libán Bande GonzálezJavaFXJavahttps://foojay.io/today/announcing-skinning-javafx-applications/A practical, code-first book on building modern, visually distinctive JavaFX interfaces — from theming to custom dashboard controls built from scratch.https://foojay.io/today/my-love-hate-relationship-with-java-formatters/Wed, 30 Sep 2026 00:00:00 +0000Alex AbashevDeveloper ToolsJavaOpinionhttps://foojay.io/today/my-love-hate-relationship-with-java-formatters/Learning to love google-java-format, why AI agents make formatters matter even more, and why palantir-java-format now has a fork: open-java-format.https://foojay.io/today/performance-work-between-benchmarks/Wed, 30 Sep 2026 00:00:00 +0000Shai AlmogJavahttps://foojay.io/today/performance-work-between-benchmarks/Codename One tackles GC, maps, startup, and JavaScript overhead, and adds native drag and drop plus cross-device continuity. Javadoc joins website search...https://foojay.io/today/javafx-links-of-september-2026/Wed, 30 Sep 2026 00:00:00 +0000Frank DelporteJavaFXhttps://foojay.io/today/javafx-links-of-september-2026/Here are the JavaFX LinksOfTheMonth of September 2026. This was a big month with the release of JavaFX 27!https://foojay.io/today/durable-execution-is-a-property-not-a-product/Wed, 30 Sep 2026 00:00:00 +0000Nicholas D'hondtOpinionDurabilityJavahttps://foojay.io/today/durable-execution-is-a-property-not-a-product/Durable execution is a property your existing database can provide, not a product you must buy. Measured, with receipts you can run yourself.https://foojay.io/today/the-java-21-doomsday-clock-countdown/Tue, 29 Sep 2026 00:00:00 +0000Dana CraneJavaOpenJDKOpenJDK Migrationhttps://foojay.io/today/the-java-21-doomsday-clock-countdown/Oracle's free NFTC license for Java 21 has expired, and the October 2026 quarterly update is the first one enterprises have to pay for. Here are the three options left, and why the timeline is short!https://foojay.io/today/testing-kafka-consumer-recovery-contracts-with-testcontainers-and-junit/Mon, 28 Sep 2026 00:00:00 +0000Ishan ShahJavaKafkaTestcontainersTestinghttps://foojay.io/today/testing-kafka-consumer-recovery-contracts-with-testcontainers-and-junit/Use Testcontainers and JUnit to test Kafka consumer recovery contracts for duplicate delivery, malformed records, and offset-boundary failures.https://foojay.io/today/how-much-will-post-quantum-migration-cost-your-java-codebase/Mon, 28 Sep 2026 00:00:00 +0000Arpan SharmaSecurityJavaResearchhttps://foojay.io/today/how-much-will-post-quantum-migration-cost-your-java-codebase/A static auditor that estimates what a post-quantum migration will cost a Java codebase, run across 27 popular Java projects to show where the cost hides.https://foojay.io/today/ai-assisted-genealogy-follow-up/Sun, 27 Sep 2026 00:00:00 +0000Nicolas FrankelAIUse Caseshttps://foojay.io/today/ai-assisted-genealogy-follow-up/A follow-up on AI-assisted genealogy: source quality with GEDCOM QUAY, per-site browsing skills, Playwright sessions, transcriptions, and hiccups along the way.https://foojay.io/today/one-database-two-models-mysql-json-duality-views-java/Sat, 26 Sep 2026 00:00:00 +0000A N M Bazlur RahmanJavaDatabasesAILangChain4jhttps://foojay.io/today/one-database-two-models-mysql-json-duality-views-java/Explore MySQL JSON Duality Views in Java: simpler reads, safe document writes, ORM comparisons, and read-only tools for a local AI assistant.https://foojay.io/today/voip-vpn-builders/Fri, 25 Sep 2026 00:00:00 +0000Shai AlmogJavahttps://foojay.io/today/voip-vpn-builders/Codename One adds native call management and VPN APIs, while its builders generate the platform services, frameworks, permissions, and extension plumbing...https://foojay.io/today/boxlang-ai-340-gateways-hitl-security/Fri, 25 Sep 2026 00:00:00 +0000Luis MajanoAIBoxLangGenAISecurityDeveloper Toolshttps://foojay.io/today/boxlang-ai-340-gateways-hitl-security/BoxLang AI 3.4.0 introduces gateways, durable human approvals, layered AI security, normalized reasoning, run control, and improvements across providers.https://foojay.io/today/diagrams-as-code-mermaid-support-on-foojay/Thu, 24 Sep 2026 00:00:00 +0000Frank DelporteFoojayhttps://foojay.io/today/diagrams-as-code-mermaid-support-on-foojay/Foojay articles now render Mermaid diagrams from a fenced code block. Write the diagram in Markdown, get a real diagram, and keep it reviewable in the pull request.https://foojay.io/today/asciidoc-support-on-foojay/Wed, 23 Sep 2026 00:00:00 +0000Frank DelporteFoojayhttps://foojay.io/today/asciidoc-support-on-foojay/Foojay articles can now be written in AsciiDoc as well as Markdown. Named blocks, real tables, source callouts and admonitions — the things Markdown has no syntax for.https://foojay.io/today/announcing-the-new-foojay/Tue, 22 Sep 2026 00:00:00 +0000Frank DelporteFoojayhttps://foojay.io/today/announcing-the-new-foojay/Foojay has a new home: a static, open-source site where publishing an article is a pull request. Same URLs, same archive, much faster, and new features.https://foojay.io/today/world-geography-gotchas/Sun, 20 Sep 2026 05:51:17 +0000Nicolas FrankelTutorialshttps://foojay.io/today/world-geography-gotchas/Years ago, a colleague of mine told me about two pockets of foreign land surrounded by Switzerland: Campione d'Italia and Büsingen am Hochrhein,…https://foojay.io/today/boxlang-1-17-0-released-module-inception-cli-checker-jar-loading-and-much-more/Thu, 17 Sep 2026 20:20:32 +0000Cristobal EscobarAIBoxLangDeveloper ToolsGenAIJavaTestingToolshttps://foojay.io/today/boxlang-1-17-0-released-module-inception-cli-checker-jar-loading-and-much-more/BoxLang has always been an extensible language. As of 1.17.0, it is a hierarchically extensible one. Modules can now contain other modules; aka Module…https://foojay.io/today/whats-new-in-the-september-2026-azul-payara-release/Wed, 16 Sep 2026 16:46:54 +0000Dominika TasarzJakarta EEPayarahttps://foojay.io/today/whats-new-in-the-september-2026-azul-payara-release/MicroProfile 7.1 lands on the commercial lines, OpenTracing is removed, and Jakarta Agentic AI reaches Payara Micro in the September Azul Payara release.https://foojay.io/today/can-you-explain-the-diff-your-ai-agent-just-wrote/Tue, 15 Sep 2026 14:12:01 +0000Viktoria EvdokimovaAIIntelliJ IDEAJavaKotlinLLMhttps://foojay.io/today/can-you-explain-the-diff-your-ai-agent-just-wrote/Every Java developer has been in a code review where the question is simple: What does this method do? The answer used to tell you something.https://foojay.io/today/how-i-built-an-ai-assistant-for-my-career-with-java-spring-ai-and-mongodb/Tue, 15 Sep 2026 11:51:17 +0000Ricardo MelloAIDatabasesJavaMongohttps://foojay.io/today/how-i-built-an-ai-assistant-for-my-career-with-java-spring-ai-and-mongodb/How one developer built a personal AI assistant in Java using Spring AI, MongoDB Vector Search, conversation memory, and tool calling with Calendly.https://foojay.io/today/hello-java-27-have-you-been-working-out/Tue, 15 Sep 2026 08:00:00 +0000Hanno EmbregtsJavaJava CoreJEPshttps://foojay.io/today/hello-java-27-have-you-been-working-out/Java 27 is like that friend that you haven't seen all summer, and when you finally see them again it's clear that they spent a lot of time in the gym. Bringing numerous improvements to performance and security, this version of Java seems to be in top shape. This post has all the info!https://foojay.io/today/foojay-podcast-101/Mon, 14 Sep 2026 06:11:42 +0000Frank DelporteSimon RitterJavaJava CoreOpenJDKPodcasthttps://foojay.io/today/foojay-podcast-101/Simon Ritter on JDK 27: compact object headers, G1 everywhere by default, post-quantum TLS, monthly security updates, and Valhalla's first preview in Java 28.https://foojay.io/today/come-for-java-get-a-whole-lot-more/Fri, 11 Sep 2026 09:33:46 +0000Richard FichtnerConferenceEventsJavaJUGshttps://foojay.io/today/come-for-java-get-a-whole-lot-more/JCON USA returns inside IBM TechXchange 2026 with two rooms of deep Java content, a dedicated community home, and direct access to one of the years…https://foojay.io/today/reflection-free-serialization-on-the-jvm-four-formats-in-avro-out/Thu, 10 Sep 2026 06:56:00 +0000Dmitry MoskalyukData EngineeringJavaKotlinhttps://foojay.io/today/reflection-free-serialization-on-the-jvm-four-formats-in-avro-out/I run a model layer that accepts the same business data in JSON, XML, YAML, and TOML and converts it all to Avro. The project was greenfield, so the…https://foojay.io/today/one-base-url-many-coding-agents-what-an-openai-compatible-gateway-looks-like-from-java-net-http/Wed, 09 Sep 2026 16:09:53 +0000Viktoria EvdokimovaAIDebuggingIntelliJ IDEAJavaJava BeginnerJava CoreJavaFXJavaProKotlinLLMMachine LearningRelease Noteshttps://foojay.io/today/one-base-url-many-coding-agents-what-an-openai-compatible-gateway-looks-like-from-java-net-http/Somewhere in every coding agent there is an HTTP client. Claude Code, Codex, Cursor, Cline, OpenCode: strip away the terminal UI or the editor pane and…https://foojay.io/today/masking-a-jvm-thread-dump-without-breaking-the-analysis/Wed, 09 Sep 2026 07:32:00 +0000Felipe MaschioJavaJava CoreSecurityhttps://foojay.io/today/masking-a-jvm-thread-dump-without-breaking-the-analysis/A few weeks ago I posted on r/java about detecting virtual thread pinning from a plain thread dump. The technical discussion was fine. The comment that…https://foojay.io/today/debugging-is-invariant-discovery-what-one-kafka-session-taught-us-about-ai-agents/Tue, 08 Sep 2026 14:14:36 +0000Viktoria EvdokimovaAIDebuggingGenAIJakarta EEJavaJava BeginnerJava CoreJavaFXJavaProLLMhttps://foojay.io/today/debugging-is-invariant-discovery-what-one-kafka-session-taught-us-about-ai-agents/Every Java team has a sentence like this one somewhere: Any operation on a TID must go through the single asynchronous path and must not let TMS and EMV…