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java-springboot

Write and review application code in an existing Spring Boot 3/4 project: controllers, validation and ProblemDetail errors, Spring Data JPA/JDBC, RestClient and HTTP interfaces, configuration properties, Kafka/AMQP, caching, scheduling, virtual threads, AOT and startup tuning. Use when adding or changing features. To scaffold a new project use create-spring-boot-java-project instead.

skills/java-springboot/SKILL.md

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# Spring Boot application development

Opinionated rules plus a router to deeper references. Code samples in the references were compiled and run on Spring Boot 4.1.1 (Spring Framework 7) and, where they differ, on Boot 3.5.16 (Framework 6.2). Boot 3 vs 4 differences are marked "Boot 3" / "Boot 4" in each reference.

## Before writing code

1. **Detect, do not assume:** read `pom.xml`/`build.gradle(.kts)` for the Spring Boot version, Java version, starters in use (`spring-boot-starter-web` is Boot 3, `spring-boot-starter-webmvc` is Boot 4), persistence (JPA, JDBC), the migration tool, the test setup, and the package layout and naming conventions of the existing code. Match them.
2. **Never upgrade Spring Boot, Java or dependencies implicitly.** A Boot 3 -> 4 move is a deliberate task (`spring-boot-4-migration`).
3. **Ask before adding infrastructure:** a broker (Kafka, RabbitMQ), a cache provider, a new database, or a scheduler/async setup. Add only what the user requested, with the Boot-managed version (no explicit version for BOM-managed artifacts, never `latest`).
4. **Verify every change** with the project's own build: `./mvnw verify` or `./gradlew build` (plain `mvn`/`gradle` if no wrapper). Integration tests need Docker when they use Testcontainers.

## Router

| Task | Read |