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Java Articles by Foojay.io

June, 2025

  • 13 June

    How ReadyNow Improves Java Warmup Time

    Author: Frank Delporte Original post on Foojay: Read More Table of Contents How ReadyNow achieves faster compilationsNormal startupWhat’s in the fileStartup with fileComparing the different runs Tier 1 compile counts Tier 2 Compile Counts Compiler queue run Conclusion This is the second blog post in a series on faster Java application warmup. The first blog post, Faster Java Warmup: CRaC …

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  • 12 June

    Java Concurrency Best Practices for MongoDB

    Author: Vivekanandan Sakthivelu Original post on Foojay: Read More Table of Contents Lost updatesDirty readsNon-repeatable readsPhantom readsHow to avoid these issues Isolation Read concern Write concern In a multi-threaded, distributed environment like MongoDB, when clients execute queries concurrently, operations interleave with one another if they are not isolated, whether those operations involve single-document or multi-document operations. For instance, Client C1’s …

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  • 11 June

    Performance Best Practise No. 1: Optimize Database Operations

    Author: Ondro Mihalyi Original post on Foojay: Read More Table of Contents How GlassFish helps with improving database performance Connection pool configuration JDBC batching Jakarta Persistence (JPA) batching Next Steps Database operations are a very critical part of most applications in regards of performance. There are multiple reasons why database operations can significantly contribute to lower performance: The database often …

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  • 10 June

    Intro to RAG: Foundations of Retrieval Augmented Generation, part 2

    Author: Jennifer Reif Original post on Foojay: Read More Table of Contents GenAI systems as layersVector RAGGraph RAGAI AgentsModel Context Protocol (MCP)What should you choose?Wrapping up!Resources In the last post, we discussed the basics of Retrieval Augmented Generation (RAG) and how it enhances the capabilities of Large Language Models (LLMs) by integrating them with external knowledge sources. We also introduced …

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  • 9 June

    Authoring an OpenRewrite Recipe

    Author: Nicolas Frankel Original post on Foojay: Read More Table of Contents My use caseRecipe basicsPutting it all togetherTesting the recipePotential future worksConclusion I’ve been eying OpenRewrite for some time, but I haven’t had time to play with it yet. In case you never heard about OpenRewrite, OpenRewrite takes care of refactoring your codebase to newer language, framework, and paradigm …

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  • 6 June

    Faster Java Warmup: CRaC versus ReadyNow

    Author: Frank Delporte Original post on Foojay: Read More Table of Contents What happens at Java startup Java warmup phase  Deoptimizations Solutions Provided by Azul Coordinated Restore at Checkpoint (CRaC)  ReadyNow  Cloud Native Compiler CRaC Compared to ReadyNow Conclusion  This is the first blog post in a series on faster Java application warmup with ReadyNow.Azul has developed different solutions to help …

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  • 5 June

    MongoDB Aggregation Framework: A Beginner’s Guide

    Author: Tim Kelly Original post on Foojay: Read More Table of Contents Aggregation pipelineAggregation stages $Match $Project $Unwind $Group $Sort $AddFields Combining stagesWrapping up Finding exactly the data we need isn’t always a simple task. You’ve probably faced situations where you needed to filter information, group it, and even perform calculations to produce a final result. And often, delivering this …

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  • 4 June

    Java’s Structured Concurrency: Finally Finding Its Footing

    Author: A N M Bazlur Rahman Original post on Foojay: Read More Table of Contents What Actually Changed This Time The Core Concept Remains Strong The headline change: static factory methods Joiners: pick your success policy Rolling your own Joiner Better cancellation and deadlines Scoped values ride along Guard-rails against misuse Observability improvements Some more examples to try out Final …

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  • 3 June

    Cloudflare Tunnel for Home Assistant

    Author: Nicolas Frankel Original post on Foojay: Read More Table of Contents The initial setupCloudflare Tunnel for Home AssistantRemoving Let’s Encrypt add-onConclusion I continue to take care of my Home Assistant. This week, I replaced my original setup with Cloudflare Tunnel. This is the 6th post in the My journey with Home Assistant focus series. Other posts include: Why Home …

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  • 2 June

    Foojay Podcast #72: JCon Report, Part 1 – Grow your career, public speaking, 30 years of Java, greener coding,…

    Author: Frank Delporte Original post on Foojay: Read More Table of Contents VideoPodcast (Audio only)Content On May 13th and 14th, Foojay attended the JCON conference in Köln, Germany, where we did over 30 live-stream interviews. In this episode, we present to you the first set of these interviews, in which we focus on celebrating 30 years of Java, how you …

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