Currently src:proguard builds a single pkg:proguard package providing
both the GUI, CLI programs, the Gradle plugin and the library. Since
Gradle depends on Progaurd's library, even if a package build-depends
on default-jdk-headless it still pulls the entire JRE and some GUI
desktop packages if it uses Gradle to build.
Please consider separate the components of Proguard into multiple packages.
This is the maintainer address of Debian's Java team
debian-j...@lists.debian.org for discussions and questions.