# Intellij

> IntelliJ IDEA JetBrains IDE with smart completion. Use for JVM development.

- Skill: `g1joshi/intellij` (Agent Skill)
- Install (CLI): `npx skillmds@latest add g1joshi/intellij`
- Raw SKILL.md: https://api.skillmd.com/api/skills/g1joshi/intellij/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: G1Joshi (https://skillmd.com/u/g1joshi)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/g1joshi/intellij

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# IntelliJ IDEA

IntelliJ IDEA is the premier IDE for Java and Kotlin. v2025.1 introduces **Java 24** support, **K2 Mode** (Beta/Stable), and a unified **AI Assistant**.

## When to Use

- **Java/Kotlin**: Unbeatable refactoring and static analysis.
- **Spring Boot**: Deep understanding of Spring beans and endpoints.
- **Large Monorepos**: Indexing is smarter and incremental.

## Core Concepts

### Indexing

IntelliJ builds a massive index of your code. This enables "Find Usages" to be instant and 100% accurate.

### Intentions (Alt+Enter)

The magic key. Fixes warnings, optimizes imports, converts Java to Kotlin.

### Run Configurations

Powerful system to launch apps, tests, and docker containers.

## Best Practices (2025)

**Do**:

- **Enable K2 Mode**: If using Kotlin, the new frontend compiler is much faster.
- **Use "Search Everywhere"**: Double-shift (`Shift-Shift`) finds files, classes, actions, and settings.
- **Share Run Configs**: Check `.run/` configurations into Git so the team shares launch setups.

**Don't**:

- **Don't disable indexing**: Let it finish. The IDE is dumb without it.

## References

- [IntelliJ IDEA Documentation](https://www.jetbrains.com/idea/documentation/)