Some steps to write a cartridge
· This article shows you how to write an AndroMDA cartridge in 10 distinct steps,
using a sample cartridge which generates an Ant-like build script from a UML deployment model.
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 steps-to-write-a-cartridge-3.4.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.