This module exists solely to package all other jre modules into a single uber jar. This makes deploying to non-mavenized targets much easier. Of course, you would be wise to inherit your dependencies individually; the uber jar is intended for projects like collide, which have complex configuration, and adding many jars would be a pain. It also allows dependent modules to discover new features, as modules graduate from labs to final, they will be added here. As you type X_, autocomplete will expose newly added services.