the Netflix “Freedom and Responsibility” culture. “Do it for me, and I’m happy to accept the change.” — Netflix engineer “[Challenge accepted!]” — Jonathan Schneider, OpenRewrite creator & Moderne co-founder 5
Multi-repository mode OpenRewrite OSS Project Serialize LSTs to disk to scale across repos OpenRewrite Gradle Plugin OpenRewrite Maven Plugin GitHub Copilot upgrade assistant for Java Amazon Q Developer JetBrains IntelliJ IDEA Broadcom App Advisor Moderne Platform Moderne CLI / IDE plugin Single- tenant SaaS Moderne proprietary IP Moderne DX Air-gapped service Shared OSS recipe ecosystem plus Moderne proprietary recipes for major migrations and security Codemods, linters, & other refactoring tech
like No longer define an expected exception on the ‘@Test’ annotation Auto-refactoring relocates the original contents into a lambda argument in an ‘assertThrows’ call and formats per existing code style EXAMPLE: JUnit 4 to 5 migration: “assertThrows” call added to the test’s method body Accurate code changes that match the local code style across 1,000s of repositories. 9
(LST) Visitor Pattern Recipes A structured, language- specific representation of code that preserves both syntax and semantics without losing original formatting or comments — enabling precise analysis and transformation at scale. A deterministic program that defines what to find and how to change it in code, using language-aware search and transformation logic to automate research, upgrades, remediations, and refactorings. A traversal strategy used by recipes to systematically visit nodes in the lossless semantic tree, enabling targeted analysis and modification based on node type and context.
other code representations? Characterized by serialization, type attribution, format preservation, and other metadata + another 600,000 nodes that didn’t fit in this graphic Text-based search Abstract Syntax Tree (AST) Lossless Semantic Tree (LST)
License Version 2.0 Moderne Proprietary License Moderne Source Available License Fully open source, covering core framework, plugins, and community recipes. Available for use and customization by users and companies with their own code. Fully available to Moderne customers. Example recipes: • Find annotations • Dependency report • Format Java code Example recipes: • Migrate to Spring Boot 3.3 • Migrate Log4j to SLF4J • AssertJ best practices Example recipes: • Migrate to Spring Boot 3.5 • Post quantum cryptography • Fix vulnerable dependencies
and Gradle Build Plugins Moderne SaaS Moderne CLI Use build plugins to run a recipe against a single repository. LSTs are stored in memory. Use the Moderne CLI to run a recipe against multiple public repositories. LSTs are serialized to disk. Requires a license to run on private repositories. Browse a marketplace of over 5,000 recipes and run any of them against a selection of over 38,000 open source repositories. mvn rewrite:run gradle rewriteRun mod run . --recipe=<recipe> https://app.moderne.io
weeks US and EU friendly time slots Moderne experts provide 4 hours introduction and subsequent advanced training course on OpenRewrite Register for the next slot on https://www.moderne.ai/moderne- openrewrite-training-hub
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