The source level 7 is hardcoded in the build properties[1]. [1] https://sources.debian.org/src/xz-java/1.9-1/build.properties
__ This is the maintainer address of Debian's Java team <https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/pkg-java-maintainers>. Please use [email protected] for discussions and questions.
