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<p>The moment a plugin needs account data, a simple API call turns into an authentication problem. The bad shortcut is familiar: ask the user to create a personal access token (PAT), make them paste it into settings, and hope it never leaks.</p> <p>For a JetBrains IDE plugin, use this flow instead: the user clicks the <strong>Login</strong> button, the browser opens, the provider handles sign-in, the IDE receives a callback, and the plugin stores the token.</p> <p>At a high level, the plugin will:</p> <ol> <li>Open the provider&#8217;s authorization page in the browser.</li> <li>Receive the OAuth2 callback inside the IDE.</li> <li>Validate the returned <code>state</code>.</li> <li>Exchange the authorization code with PKCE.</li> <li>Store the access token in <code>PasswordSafe</code>.</li> </ol> <p>This post uses GitHub as the OAuth2 provider, but the same shape works elsewhere. Scopes, URLs, token responses, and refresh rules will change.</p> <p><strong>Samp…

<p><strong>Trained from scratch and designed for practical deployment, Mellum2 is built for routing, Q&amp;A, sub-agents, and private AI use in software engineering systems.</strong></p> <p>Today, we’re open-sourcing Mellum2, a 12B model engineered to solve the hardest parts of production AI: latency, throughput, and cost. Built from scratch and released under the Apache 2.0 license, <a href="https://www.jetbrains.com/mellum/" target="_blank" rel="noopener">Mellum2</a> offers a high-performance, cost-efficient alternative for your infrastructure.</p> <p>Mellum began with <a href="https://blog.jetbrains.com/ai/2025/04/mellum-goes-open-source-a-purpose-built-llm-for-developers-now-on-hugging-face/">code completion</a>; now we’ve evolved it to handle both natural language and code. It is now a versatile tool ready to power routing, summarization, and intermediate reasoning steps across your modern AI workflows.</p> <p>Whether you want to experiment, fine-tune, or deploy at scale…

<figure class="wp-block-image size-full"><img style="width:100% !important; height:auto !important; max-width:100% !important;" decoding="async" loading="lazy" src="https://blog.jetbrains.com/wp-content/uploads/2026/06/ChatGPT-Image-Jun-1-2026-10_27_53-AM.png" alt="How to fix common TypeScript issues with Qodana " class="wp-image-710890"/></figure> <p>Most TypeScript projects already run <a href="https://eslint.org/" target="_blank" rel="noopener">ESLint</a> with <code><kbd>@typescript-eslint</kbd></code>. That covers a lot: explicit <code><kbd>any</kbd></code>, floating promises, non-null assertions, and more. If your linting setup is solid, you&#8217;re catching the obvious issues in the editor before code review.</p> <p>ESLint rules can&#8217;t produce cross-file findings. Each rule runs within a single file&#8217;s scope, which means ESLint can&#8217;t tell you that an export is unused everywhere in the codebase, that an <kbd>any</kbd>-typed value from one file is causing un…

<p><em>Disclaimer: This article was created using AI-based writing and communication companions. With their help, the core topics of this rich and nuanced livestream were distilled into a compact blog post format.</em></p> <p>How do Rust IDEs understand code? That was the central question explored in a recent RustRover livestream featuring Lukas Wirth, Rust engineer at Zed and team lead for <a href="https://rust-analyzer.github.io/" target="_blank" rel="noopener">rust-analyzer</a>, and Vlad Beskrovny, engineer on <a href="https://www.jetbrains.com/rust/" target="_blank" rel="noopener">RustRover </a>at JetBrains. Rather than comparing editors or debating preferences, the discussion focused on what actually happens under the hood when an IDE analyzes Rust code.</p> <p>If you missed the livestream, you can watch the full recording on JetBrains TV. Below is a structured recap of the key questions and insights from the session.</p> <figure class="wp-block-embed is-type-video is-pr…

<p>Hibernate 7.4 introduced <a href="https://docs.hibernate.org/orm/7.4/whats-new/" target="_blank" rel="noopener">several improvements</a> that simplify loading a page of data along with their associated child collection, historical data access, and audit logging.</p> <p>The article will focus on the following features:</p> <ul> <li><strong>Limits and Fetch Joins</strong>: How Hibernate 7.4 improves working with paginated queries that include fetched associations.</li> <li><strong>History and Audit Tables</strong>: How the new capabilities support querying entity state across time and working with historical data.</li> </ul> <p><br><strong>You can check out the sample code for this article in this </strong><a href="https://github.com/sivaprasadreddy/hibernate-7.4-demo" target="_blank" rel="noopener"><strong>GitHub repository</strong></a><strong>.</strong></p> <h2 class="wp-block-heading">Limits and Fetch Joins</h2> <p>One common requirement in data-driven applicatio…

<p><a href="https://deepmind.google/blog/alphaevolve-impact/" rel="noopener" target="_blank">AlphaEvolve</a> is a Google DeepMind algorithm-discovery system that uses Gemini to generate, test, and refine possible algorithm improvements. Its job is not to answer questions; it searches for faster ways to solve complex algorithmic problems. We tried it on a narrow but important part of IntelliJ-based IDEs: indexing, the background work that makes navigation, search, completion, refactorings, inspections, and other code insight available after a project opens.</p> <p>That makes indexing speed a simple metric to say out loud and a hard metric to improve. It depends on the language, the framework, the shape of the project, background IDE work, and the storage layer underneath the indexes. Small changes can disappear in noise. Some wins are real in a microbenchmark and invisible in a full IDE run.</p> <p>We already invest a lot of engineering time here, and that manual performance work…

<p>Hey!&nbsp;</p> <p>This month’s list is short, but every item is worth your time.&nbsp;</p> <p>Apply for one of up to 40 JetBrains Foundation scholarships for the CSAI BSc program by June 9, try a new AI tools course for developers, discover a program that brings hands-on coding practice into JetBrains IDEs, and read about the value of productive struggle in learning to code.</p> <div class="newsletter"> <h2>Learning highlights</h2> <article class="newsletter__post"> <img style="width:100% !important; height:auto !important; max-width:100% !important;" decoding="async" class="newsletter__post-img" src="https://blog.jetbrains.com/wp-content/uploads/2026/05/1779443084114.jpeg" alt=""> <div class="newsletter__post-text"> …

<p>Today we&#8217;re rolling out the first bug-fix for TeamCity On-Premises 2026.1 servers. This update addresses over 20 issues and performance issues, including:</p> <ul> <li>Build agent alternate IP addresses ignored by TeamCity;</li> <li>Damaged Rake plugin;</li> <li>Failing uploads to S3 buckets;</li> <li>.NET builds with &#8220;Exists&#8221; agent requirements cannot find a compatible build agent to run.</li> </ul> <p>See <a href="https://www.jetbrains.com/help/teamcity/teamcity-2026-1-1-release-notes.html" target="_blank" rel="noopener">TeamCity 2026.1.1 Release Notes</a> for the complete list of resolved issues.</p> <h3 class="wp-block-heading"><strong>Why update?</strong></h3> <p>Staying up to date with minor releases ensures your TeamCity instance benefits from the following:</p> <ul> <li>Performance improvements.</li> <li>Better compatibility with integrations.</li> <li>Faster, more stable builds.</li> <li>Enhanced security for your workflow…

<p>After careful consideration, we have made the difficult decision to sunset DataSpell as a standalone product.</p> <p>DataSpell was created to focus on the needs of data science and analytics professionals within the JetBrains ecosystem. It allowed us to build and refine a dedicated experience for working with Jupyter notebooks, data exploration, and analytical workflows. These improvements have been successfully integrated into PyCharm, where they can benefit a much broader audience.&nbsp;</p> <p>Today, we’ve reached a point where maintaining a separate product is no longer the most effective path forward. This choice is part of JetBrains’ broader strategy to build a more cohesive ecosystem around the workflows users rely on most. By consolidating these capabilities in PyCharm, we can move faster, simplify the overall experience, and deliver more value in one place.</p> <h2 class="wp-block-heading">What’s next for DataSpell users?</h2> <p>Starting from September 1, 2026…

<p>dotMemory Unit has long served as a unit testing framework for detecting memory issues in .NET code. We are grateful to everyone who has used it as part of their development and testing workflows.</p> <p>After careful consideration, we have decided to retire dotMemory Unit. The project will no longer receive active maintenance, compatibility updates, or security fixes, and we recommend that users plan to discontinue its use.</p> <h2 class="wp-block-heading">Why we’re making this change</h2> <p>This decision is based on several technical, security, and product considerations.</p> <p>dotMemory Unit has not been actively developed for some time and does not support the latest .NET versions. Bringing it up to modern compatibility, reliability, and security standards would require a substantial architectural redesign.</p> <p>In addition, dotMemory Unit generates workspaces in a legacy format that is incompatible with recent versions of dotMemory. This creates friction for…

<p>Cloud9 and JetBrains have been working together on projects that connect software development and esports, from the <a href="https://blog.jetbrains.com/blog/2026/04/16/sky-s-the-limit-hackathon-180-projects-connecting-developers-and-esports/" target="_blank" data-type="link" data-id="https://blog.jetbrains.com/blog/2026/04/16/sky-s-the-limit-hackathon-180-projects-connecting-developers-and-esports/" rel="noreferrer noopener">Sky’s The Limit hackathon</a> to custom tools built for live events, podcasts, and team content.</p> <p>One of the latest results of this collaboration is Cloud9 JetStream, a <a href="https://plugins.jetbrains.com/plugin/31876-cloud9-jetstream" data-type="link" data-id="https://plugins.jetbrains.com/plugin/31876-cloud9-jetstream" target="_blank" rel="noopener">custom theme</a> for JetBrains IDEs.</p> <figure class="wp-block-image size-full"><img style="width:100% !important; height:auto !important; max-width:100% !important;" decoding="async" loading="laz…

<p><em>This is a guest post from <a href="https://blog.jetbrains.com/pycharm/2026/05/build-a-live-object-detection-app-for-reachy-mini-with-tensorflow-and-pycharm/#author" data-type="link" data-id="https://blog.jetbrains.com/pycharm/2026/05/build-a-live-object-detection-app-for-reachy-mini-with-tensorflow-and-pycharm/#author">Iulia Feroli</a>, founder of the Back To Engineering YouTube community.</em></p> <figure class="wp-block-image size-full"><img style="width:100% !important; height:auto !important; max-width:100% !important;" decoding="async" loading="lazy" src="https://blog.jetbrains.com/wp-content/uploads/2026/05/PC-social-BlogFeatured-1280x720-1-5.png" alt="Build a Live Object Detection App" class="wp-image-709808"/></figure> <p>In this tutorial, we build a live object detection app using TensorFlow and <a href="https://www.jetbrains.com/pycharm/" target="_blank" rel="noopener">PyCharm</a>, then deploy it onto the Reachy Mini open-source robot for real-time object tracki…

<p>In 2026, the world of AI is changing at a serious pace. The days of AI systems dealing solely in single-prompt interactions are coming to an end. Instead, these models are evolving into <a href="https://www.jetbrains.com/pycharm/data-science/" target="_blank" rel="noopener">agentic systems</a> – long-running, goal-driven software enabled by agentic frameworks that are becoming a critical layer in modern application architecture.</p> <p>This rapid shift means that Python developers building autonomous systems are increasingly relying on agentic frameworks to manage reasoning, memory, tools, and collaboration among multiple agents.</p> <p>You’ve probably already heard of some of the most popular frameworks. LangChain and AutoGen have risen to prominence, but there are dozens more, many of them open-source and only one to two years old. With so many frameworks promising different agentic capabilities, the real challenge is knowing which ones are best suited for the kind of appli…

<p>Toolbox App 3.5 focuses on making daily work smoother and managed development environments easier to monitor. The app now supports interface zooming with familiar shortcuts, provides OpenTelemetry metrics for enterprise remote development connections, and handles several long-standing reliability issues more gracefully.</p> <h2 class="wp-block-heading">Remote development observability</h2> <p>The Toolbox App now emits OpenTelemetry metrics for remote development connection latency and reliability. You can send them to Grafana, Datadog, Prometheus, or another OTEL-compatible stack to monitor connection health across your developer fleet.</p> <h2 class="wp-block-heading">Zoom controls</h2> <p>You can now zoom the Toolbox App interface using familiar keyboard shortcuts: Cmd/Ctrl + to zoom in, Cmd/Ctrl &#8211; to zoom out, and Cmd/Ctrl 0 to reset. The setting persists across restarts, so your preferred zoom level is preserved.</p> <h2 class="wp-block-heading">Cleaner upd…

<p>WPF Hot Reload is now available in Rider, starting with the 2026.2 EAP 2 build. You can edit your XAML while your app is running under the debugger and see the changes immediately, with no rebuild, no restart, and no losing your place in the application. Together with the C# Hot Reload support that&#8217;s already in Rider, this completes the Edit and Continue workflow for WPF.</p> <p>This one has been a long time coming, and we want to be straight about that. The <a href="https://youtrack.jetbrains.com/issue/NETPM-371/Support-Hot-Reload-for-WPF-projects-in-Rider" target="_blank" rel="noopener">request for WPF Hot Reload</a> is one of the most upvoted issues in Rider&#8217;s entire history. We read every word of your comments, and the feature we’re shipping today is shaped directly by that feedback.&nbsp;</p> <p>A quick, honest note before we go further: this is a <strong>beta</strong>. The surface area of WPF is large, and some scenarios are not covered yet. We&#8217;ll lay …

<p>RustWeek 2026 brought more than 900 Rust developers, educators, and maintainers to Utrecht, Netherlands, for a few days of talks, hallway conversations, community meetups, hackathons, and workshops about all things Rust.</p> <p>As a Gold sponsor for the third year in a row, the RustRover team joined the event to support the Rust ecosystem, connect with developers in person, and learn more about how people are building with Rust today.</p> <p>Along the way, we sat down with members of the Rust community for a series of quick interviews about the future of Rust. In this post, we’re sharing the conversations, trends, and community moments that stood out most to us.</p> <h2 class="wp-block-heading">What brought RustRover to RustWeek 2026</h2> <p>Developer conferences are one of the few places where conversations happen completely outside of tickets, issue trackers, and release notes. For our team, RustWeek 2026 was an opportunity to step away from our screens and spend time…

<p>The Kotlin 2.4.0 release is out! Here are the main highlights:</p> <ul> <li><strong>Language</strong>: Stable context parameters, explicit backing fields, and multiple features for annotation use-site targets.</li> <li><strong>Standard library</strong>: Stabilized support for the UUID API and support for checking sorted order.</li> <li><strong>Kotlin/JVM</strong>: Support for Java 26 and annotations in metadata enabled by default.</li> <li><strong>Kotlin/Native</strong>: Support for Swift packages as dependencies, updates on Swift export, and the CMS GC enabled by default.</li> <li><strong>Kotlin/Wasm</strong>: Incremental compilation enabled by default and support for WebAssembly Component Model.</li> <li><strong>Kotlin/JS</strong>: Support for value class export and ES2015 features in JS code inlining.</li> <li><strong>Gradle</strong>: Compatibility with Gradle 9.5.0.</li> <li><strong>Maven</strong>: Automatic alignment between Java and JVM target versions…

<p>IntelliJ IDEA 2025.3.6 is now available with the latest Oracle critical patch update for Java 21. The update includes the corresponding JetBrains Runtime changes and fixes the issue [<a href="https://youtrack.jetbrains.com/issue/IDEA-389015/jbr25.0.3-resourcemanager.sketchImporter.ResourceFileGeneratorTest-throws-ComparisonFailure" target="_blank" rel="noopener">IDEA-389015</a>], providing improved reliability and security.</p> <p>You can update to this version from inside the IDE, using the <a href="https://www.jetbrains.com/toolbox-app/" target="_blank" rel="noopener">Toolbox App</a>, or using snaps if you are a Ubuntu user. You can also download it from our <a href="https://www.jetbrains.com/idea/download/" target="_blank" rel="noopener">website</a>.</p> <p>For a comprehensive overview of the fixes, see the <a href="https://youtrack.jetbrains.com/articles/IDEA-A-2100662688" data-type="link" data-id="https://youtrack.jetbrains.com/articles/IDEA-A-2100662688" target="_blank"…

<p>Some plugin code follows this pattern:</p> <ol> <li>Save open documents.</li> <li>Get a file or directory path.</li> <li>Pass that path to something outside the IDE, such as a formatter, linter, compiler, VCS command, language server, or custom CLI tool.</li> </ol> <p>Historically, it was reasonable to assume that once the save finishes, the file on disk already contains the latest editor text.</p> <p>That is no longer guaranteed.</p> <p>The IntelliJ Platform can now update the VFS first and finish the disk write in the background a bit later. Code that reads the file through IntelliJ Platform file APIs still sees the new content immediately. Code that reads the same file through <code>Path</code>, <code>File</code>, <code>Files.*</code>, or an external process may need an explicit flush before the handoff.</p> <p>The official SDK docs cover that contract in<a href="https://plugins.jetbrains.com/docs/intellij/virtual-file.html#when-are-virtualfile-changes-persi…