"Fake" or "Dummy" are the same in this context.
Again, only the example I mentioned is "fake" or "dummy".
But it does not have to be.
You can have your normal JAR from your sources and reference the dependencies you have in the manifest Classpath attribute to add them to the classpath.
You then have a "runnable" JAR that pulls in its dependencies to the classpath automatically in a standard way without the ugly and really bad fat jars people tend to build.