IntelliJ IDEA Launches Java and Kotlin Extension for VS Code and Cursor
The 1.0 release brings JetBrains' core language intelligence to external development environments via LSP.
1Strategic Expansion of Intelligence
JetBrains has officially released version 1.0 of its Java and Kotlin extension, bringing IntelliJ IDEA's core intelligence to VS Code and Cursor. This initiative aims to provide consistent language support across various editors. By leveraging the Language Server Protocol, the company ensures that developers maintain high-quality code analysis regardless of their preferred environment.
2Collaboration with Cursor Team
The 1.0 release is the result of a deep partnership with the Cursor team to ensure a first-class experience. Cursor developers can now utilize IntelliJ's advanced refactoring, navigation, and code analysis tools directly within their agentic workflows. This integration allows for seamless project handling from the moment a developer opens their workspace.
3Optimizing for Agentic Development
Agentic development is fundamentally shifting how software is built by reducing manual editing tasks. By utilizing the Language Server Protocol directly, agents can achieve faster and more deterministic results while consuming fewer tokens. This architecture supports the evolving needs of modern AI-driven coding assistants that require precise, reliable, and performant language understanding.
4Core Technical Capabilities
The extension supports mixed-language projects and major build tools including Maven, Gradle, and Bazel. It provides smart code completion, refactoring assistance, and robust debugging features like emulated breakpoints and async stack traces. Performance is optimized to remain fast and reliable even when working within large-scale monorepos or complex enterprise-grade software projects.
5Cursor-Specific Agent Integration
Cursor users gain access to a dedicated Agents Window that utilizes its own instance of the Language Server. This setup provides specialized analysis based on IntelliJ IDEA’s inspections, including nullability support with JSpecify and Spring Framework specifics. This ensures that AI agents have the context necessary to generate accurate and safe code.
6Licensing and Compatibility
Version 1.0 marks the end of the free preview phase, now requiring an IntelliJ IDEA Ultimate subscription after a 30-day trial. The license covers usage across the desktop IDE and supported external editors. Users are advised to disable conflicting Java extensions from Red Hat or Oracle to prevent duplicated or inconsistent behavior.
7Future Roadmap for Agents
JetBrains is planning future updates to enable agents to call the Language Server directly for terminal-based workflows. Experiments are currently underway with tools like Claude Code to leverage IntelliJ’s deep understanding of Java and Kotlin. These upcoming releases aim to further reduce costs and improve performance for fully automated coding tasks.
8Milestone for Language Support
The 1.0 release represents a significant milestone rather than a finished product. JetBrains continues to solicit feedback through their issue tracker and support forms to refine the extension. This move signals a broader commitment to making their proprietary language intelligence accessible wherever developers choose to write their code, regardless of the platform.