Maybe they're historic and now it's a requirement, or maybe it's prereleases or something, but I have certainly seen some in the past. First one I can dig up: h

Maybe they're historic and now it's a requirement, or maybe it's prereleases or something, but I have certainly seen some in the past. First one I can dig up: https://repo1.maven.org/maven2/com/google/protobuf/protobuf-java/3.0.0-beta-3/ https://repo1.maven.org/maven2/com/google/protobuf/protobuf-... The newer versions certainly do have sources and javadoc, but you can't assume their presence for everything.