Mavengem Protocol and Mavengem Wagon
· mavengem protocol converts a rubygems repository on the fly to a
maven repository and the mavengem wagon uses it to provide gem
artifacts to maven POMs
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window mavengem-2.0.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.