IntelliJ IDEA Ultimate

About

IntelliJ IDEA is a Java and Kotlin IDE for developers working alongside AI agents. It lets you run multiple agents at once, in one project or several, and track which sessions are running, done, or waiting on you. You can comment on a line in a diff and send it back to the agent to act on. Its code intelligence resolves usages, dependencies, and types across the codebase, so agents can work with fewer tool calls, and you can connect the agents you use and run them with your own API key, an existing subscription, or JetBrains AI.

The IDE is also meant to help you verify AI-generated code before shipping. Debugging, testing, profiling, database tools, and built-in inspections are available without leaving the IDE. The site describes first-class Spring integration, support for Jakarta EE, Micronaut, and Quarkus, intelligent navigation, and accurate refactorings. It also mentions Git integration, class diagrams, and dependency analysis for large codebases.