# 301 Frameworks Spring Boot Core

> Use when you need to review, improve, or build Spring Boot applications — including proper usage of @SpringBootApplication, component annotations (@Controller, @Service, @Repository), bean definition and scoping, configuration classes and @ConfigurationProperties, component scanning, conditional configuration and profiles, constructor injection, bean minimization, and scheduled tasks. Part of the skills-for-java project

- Skill: `jabrena/301-frameworks-spring-boot-core` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add jabrena/301-frameworks-spring-boot-core`
- Raw SKILL.md: https://api.skillmd.com/api/skills/jabrena/301-frameworks-spring-boot-core/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- License: Apache-2.0
- Author: jabrena (https://skillmd.com/u/jabrena)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/jabrena/301-frameworks-spring-boot-core

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# Spring Boot Core Guidelines

Apply Spring Boot Core guidelines for annotations, bean management, configuration, and dependency injection.

**What is covered in this Skill?**

- @SpringBootApplication and main application class
- Component annotations: @RestController, @Service, @Repository
- Bean definition, scoping, lifecycle
- Configuration classes and @ConfigurationProperties
- Component scanning and package organization
- Conditional configuration and profiles
- Constructor dependency injection
- Bean minimization and composition
- Scheduled tasks and background processing

**Scope:** Apply recommendations based on the reference rules and good/bad code examples.

## Constraints

Before applying any Spring Boot changes, ensure the project compiles. If compilation fails, stop immediately. After applying improvements, run full verification.

- **MANDATORY**: Run `./mvnw compile` or `mvn compile` before applying any change
- **SAFETY**: If compilation fails, stop immediately — compilation failure is a blocking condition
- **VERIFY**: Run `./mvnw clean verify` or `mvn clean verify` after applying improvements
- **BEFORE APPLYING**: Read the reference for detailed rules, good/bad patterns, and constraints

## When to use this skill

- Review Java code for Spring Boot application
- Apply best practices for Spring Boot application in Java code

## Reference

For detailed guidance, examples, and constraints, see [references/301-frameworks-spring-boot-core.md](references/301-frameworks-spring-boot-core.md).