Thank you for your help. It seems actually that some packages - like jansi - depend rely on default/open JDK JRE and not on generic java2 runtime package:
* libjansi-java (dep: default-jre-headless) * libhawtjni-runtime-java (dep: default-jre-headless) * libjansi-native-java (dep: default-jre-headless) * libbatik-java (rec: openjdk-6-jre, instead of default-jre OR java2-runtime ?) Could this be fixed in sid and wheezy please ? Otherwise apt-get still wants to install openJDK when installing Java-only modules (as groovy or maven2). Thanks again >