Short instruction that routes Java version changes in Maven or Gradle builds to the java-upgrade skill and says how to install it.
English original
# Java Version Upgrades When the task changes the Java version of this project (compiler release, toolchain, `java.version`), use the `java-upgrade` skill. It detects the current version and loads only the matching guide for Java 11 → 17, 17 → 21 or 21 → 25. If the skill is not installed, install it with `gh skills install github/awesome-copilot java-upgrade` or copy `skills/java-upgrade/` from this repository. - Upgrade one LTS version at a time and run the full test suite after each step. - Check the minimum Java version supported by the project's frameworks and dependencies before raising the target.