Someone published JSR305 to Maven incorrectly. Version 2.0.1 consists of a JAR file containing both class files and source files. The problem with this approach is that IDEs won't detect the source-code files or Javadoc, making it harder to use the library.
jsr305-2.0.1jar should only contain the class files
jsr305-2.0.1-sources.jar should only contain the source files