What's New In IntelliJ IDEA 2026.1

Our developer advocates got together to discuss and demonstrate the key updates in IntelliJ IDEA 2026.1. The new version brings built-in support for more AI agents, including Codex, Cursor, and any ACP-compatible agent, and delivers targeted, first-class improvements for Java, Kotlin, and Spring. 00:00 Intro 00:43 AI updates 11:00 Support for JavaScript and TypeScript without an Ultimate subscription 14:00 Java 26 support 18:18 Command completion updates and tips & tricks 24:00 Debugger improvements 26:25 Git worktrees 30:50 Spring Data improvements 34:47 Spring Debugger 42:07 Better Kotlin Spring Routing DSL & Bean Registrar support 47:54 Improvements for Kotlin development with JPA 53:34 New Kotlin language features 58:34 Gradle best practicies 1:02:04 Streamlined Kubernetes workflows Useful links: AI updates: Codex in JetBrains IDEs: https://blog.jetbrains.com/ai/2026/01... Cursor joins the ACP registry: https://blog.jetbrains.com/ai/2026/03... ACP Agent Registry: https://blog.jetbrains.com/ai/2026/01... ACP overview: https://www.jetbrains.com/acp/ Model Context Protocol (MCP) docs: https://www.jetbrains.com/help/ai-ass... Java 26: Java 26 in IntelliJ IDEA: https://blog.jetbrains.com/idea/2026/... Learning modern Java the playful way: https://maritvandijk.com/presentation... Spring Data: Spring Data JDBC Made Easy with IntelliJ IDEA: https://blog.jetbrains.com/idea/2026/... Spring Debugger: Spring Boot Debugging – Now Remote: https://blog.jetbrains.com/idea/2026/... Kotlin: How to Avoid Common Pitfalls With JPA and Kotlin: https://blog.jetbrains.com/idea/2026/... What's new in Kotlin 2.3.0: https://kotlinlang.org/docs/whatsnew2... IntelliJ IDEA’s New Kotlin Coroutine Inspections, Explained: https://blog.jetbrains.com/idea/2026/... Gradle best practices: Gradle Best Practices - A Path to Build Happiness: https://blog.gradle.org/gradle-best-p... Best Practices for Authoring Gradle Builds: https://docs.gradle.org/current/userg... Marit's repository: https://github.com/mlvandijk/gradle-b... Join us: Website: https://jb.gg/website Blog: https://jb.gg/blog X:   / intellijidea   Bluesky: https://bsky.app/profile/intellijidea... LinkedIn:   / intellijidea   Facebook:   / intellijidea   Download IntelliJ IDEA: https://jb.gg/download-intellij-idea