spring-boot-java-upgrade-openrewrite

Comprehensive skill for automating Java and Spring Boot migrations using OpenRewrite. Supports Java version upgrades (8→11→17→25), Spring Boot (2.x→3.x→4.0), Spring Cloud, unit test migration (JUnit 4→5), database tools (Flyway/Liquibase), and security framework upgrades. Always safe with dry-run, diff review, and testing.