Microsoft for Java Developers
News, updates, and insights for Java development with Microsoft tools, Azure services, and OpenJDK.
Latest posts
Microsoft’s OpenJDK builds now ready for Java 25
We’re excited to announce that the Microsoft Build of OpenJDK binaries are now available for Java 25. As always, our builds aim to provide a high-quality, production-ready build of OpenJDK, with binaries tested across platforms (Windows, Linux, macOS) and backed by our support and release pipelines. With this release, we invite developers, teams, and organizations to start migrating to Java 25, and in doing so, to take advantage of the many enhancements that have accumulated since Microsoft Build of OpenJDK 21 (our previous LTS release). Microsoft Build of OpenJDK 25 is fully supported for deployment on Azure ...
Unlocking MCP in JetBrains: How Copilot Uses Sampling, Prompts, Resources, and Elicitation
With the enhanced capability of the MCP on JetBrains, you can now bring prompts, resources, and even interactive tools directly into your IDE interacting with MCP. This means more flexible workflows, deeper context, and smoother collaboration between Copilot and your coding environment. Let’s take a look at what you can do today with MCP Sampling, Prompts, Resources, and Elicitation. Prerequisites To easily enable everything, you can copy and paste these settings into your `mcp.json` file: MCP Sampling – Fine-Tune How Copilot Responds With MCP Sampling, you can...
Building a Runtime JAR inspector in 10 hours
Last Friday I was reviewing our backlog items in the Java Engineering Group, and found an idea we had when Log4Shell happened. To this day, there is still no main stream solution to "find in production where a given JAR is being used". Why runtime truth matters (Log4Shell) When Log4Shell hit, lots of teams hunted for log4j through source control and CI pipelines. Helpful, but incomplete. Two realities get in the way: Finding where a vulnerable artifact is present in production, at runtime, and whether is being used, is far more important than monitoring source code and build pipelines. We s...
“HTTP header exceeding 8,192 bytes” error when using the Azure SDK for Java
A recent issue was identified in the azure-resourcemanager libraries for Java regarding HTTP headers exceeding 8,192 bytes. Following analysis, this was addressed within the Azure SDK for Java by increasing the maximum response header size limit of “reactor-netty-http” to 256 KB, accommodating larger headers. To benefit from this mitigation, it is necessary to upgrade azure-core-http-netty to version 1.15.12 or later. Alternatively, if you are utilizing the BOM, please use version 1.2.36 or above. This issue originated from an update in Azure Resource Manager to add a cryptographic token to long-running-operat...
Generative AI for Beginners – Java Edition launched
IN ONE hour, all ONLINE, complete our new training for Generative AI for Beginners – Java Edition - part of the incredible Microsoft Generative AI series - Python, .NET and JavaScript. In this training get first-hand experience with Core Generative AI Techniques and Tools we’re using inside Microsoft: Quick Start 📅Book now and Learn LIVE with FREE Training! 👉 Generative AI for Beginners - Java Edition | Microsoft Reactor
Java OpenJDK July 2025 Patch & Security Update
Hello Java customers! We are happy to announce the latest July 2025 patch & security update release for the Microsoft Build of OpenJDK. Download and install the binaries today. Check our release notes page for details on fixes and enhancements. The source code of our builds is available now on GitHub for further inspection: jdk21u, jdk17u, jdk11u. Microsoft Build of OpenJDK specific updates OpenJDK21 OpenJDK17 OpenJDK11 Summary of Upstream Updates OpenJDK 21 OpenJDK 17 OpenJD...
Microsoft and LangChain4j: A Partnership for Secure, Enterprise-Grade Java AI Applications
The artificial intelligence landscape presents unprecedented opportunities for Java developers. With decades of experience building robust enterprise applications using Spring, Quarkus and Jakarta EE, Java developers are uniquely positioned to create sophisticated AI solutions. The emergence of specialized AI libraries like LangChain4j enables them to leverage their existing expertise while building secure, scalable, and maintainable AI applications. Introducing LangChain4j: A Comprehensive Java AI Library LangChain4j represents a significant advancement in Java-based AI development. This community-driven l...
Customize GitHub Copilot in JetBrains with Custom Instructions
Today, you can use Custom Instructions in JetBrains to speed up development while staying aligned with your team's coding standards and personal preferences. Whether you're working on a solo project or part of a larger team, adhering to consistent coding standards is essential. Custom Instructions provide a mechanism to reinforce team coding guidelines or embed personal coding preferences. Example: Make custom instructions for newly generated code Make sure you have the latest version of GitHub Copilot installed on you JetBrains IDE. Then, navigate to the GitHub Copilot settings to find the Custom Inst...
What’s New for Java Developers in Azure Cosmos DB (NoSQL)?
The Java ecosystem around Azure Cosmos DB has quietly grown a lot stronger in the first half of 2024. And the updates are especially exciting if you’re working on scalable apps or exploring GenAI workloads. From new support for vector search and indexing, to better throughput management and improved integrations with Apache Kafka, Spring Data, and Apache Spark, there’s a lot to unpack. If you’re building Java apps with Cosmos DB or just curious about how far the NoSQL SDK has come, you’ll want to check out this update. 👉 Continue reading: Latest NoSQL Java Ecosystem Updates (June 2024 – June 2025)