easy-extension framework offers a simple and flexible mechanism for extension points, employing a plugin
approach to endow the system with robust extensibility.
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 easy-extension-1.0.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.