wings-parent
· wingS (wingS is net generation Swing) is a Java library for developing web based AJAX applications
in a way like developing Swing based applications.
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 wings-parent-3.3.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.