Atlas is a plain-and-simple binary transformer for Java artifacts, providing a simple API to manipulate Jars as you see fit.
final Atlas atlas = new Atlas();
atlas.install(ctx -> new JarEntryRemappingTransformer(
new LorenzRemapper(mappings, ctx.inheritanceProvider())
));
atlas.run(Paths.get("input.jar"), Paths.get("output.jar"));
Atlas is made available under the Mozilla Public License 2.0, you can find a copy within Atlas' binary, or within this repository.