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Springboot 4 Migration

Pointer to the spring-boot-4-migration skill for upgrading Spring Boot 3.x projects to 4.0

Install

Apply this only when the user explicitly asks to migrate Spring Boot 3.x to 4 (or to fix failures caused by that migration). Editing the Boot version in a build file is not enough. Patch bumps within 3.x and 4.0 to 4.1 upgrades are not covered; follow the target Spring Boot version's release notes and upgrade guide for those, not the JDK-focused java-upgrade skill.

For a 3.x to 4 migration, use the spring-boot-4-migration skill. It holds the full workflow and topic references (starters, Jackson 3, testing, configuration properties, removed APIs) for Maven and Gradle.

  • Detect the current Boot version first and migrate to the latest 3.5.x before moving to 4.0.
  • Run the build and tests after each migration step.
  • Never read or print secrets such as .env files.

Get the skill from this repository: https://github.com/github/awesome-copilot/tree/main/skills/spring-boot-4-migration (install it with the GitHub Copilot CLI plugin marketplace or copy the folder to .github/skills/spring-boot-4-migration).