Closes#1976. Settings › Build Tools › Maven gets a JRE field (per project or global): empty uses the Project JDK, else the chosen JDK runs Maven sync, builds, goals and tests (JAVA_HOME). One resolver (ide_sdk::apply::maven_jdk / maven_build_env) now serves the build model, compile steps, Maven run configurations and the mvnd Java 17 check; an explicit JAVA_HOME in a run configuration still wins.