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Claude Code made 6 mistakes upgrading a legacy Spring Boot service. None reached a commit.
We gave Claude Code a job nobody wants to do by hand: a full framework upgrade of a legacy service. Java 11 and Spring Boot 2.7 at the start, with Springfox for the API docs, the old WebSecurityConfigurerAdapter that Spring Security 6 removed, and a TODO from 2019. Java 25 and Spring Boot 4.1 at…