Individual skill
spring-boot-4-migration
Migrate a Spring Boot 3.x application to Spring Boot 4.0 (Spring Framework 7, Jackson 3, modular starters, JSpecify). Use only for an explicit Boot 3.x to 4 migration, or to fix build or test failures caused by it, or to review one. Not for 3.x patch bumps or 4.0 to 4.1 upgrades; follow the target Boot version release notes and upgrade guide for those. Covers Maven and Gradle (Kotlin DSL, version catalogs).
skills/spring-boot-4-migration/SKILL.md
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SKILL.mdcore · 8,638 bytesreferences/01-prerequisites.mddoc · 1,958 bytesreferences/02-starters-and-removed-features.mddoc · 9,783 bytesreferences/03-jackson-3.mddoc · 4,292 bytesreferences/04-core-framework.mddoc · 4,338 bytesreferences/05-build-and-dependencies.mddoc · 6,366 bytesreferences/06-configuration-properties.mddoc · 3,047 bytesreferences/07-web-and-messaging.mddoc · 7,450 bytesreferences/08-testing.mddoc · 6,193 bytesreferences/09-actuator-and-observability.mddoc · 2,757 bytesreferences/10-kotlin-and-java-build-config.mddoc · 1,301 bytesreferences/11-checklist-pitfalls-resources.mddoc · 6,036 bytes
Read excerpt
# Spring Boot 3.x to 4.0 Migration
Step-by-step migration workflow. Topic details live in `references/`; load only the files relevant to the current step.
## Rules
- Never read or print secrets (`.env`, credentials, tokens in properties files).
- Change one thing per step and run the test suite after each step; commit nothing you cannot build.
- Pin versions explicitly; never use `latest` or open-ended ranges.
- Check the official sources when unsure: the Spring Boot 4.0 Migration Guide on the Spring Boot GitHub wiki and the release notes on spring.io.
## Workflow
1. **Detect the current state**