OPS4J Pax Web WAR Samples - Vaadin 8 (old)
· https://vaadin.com/docs/v8/framework/getting-started/getting-started-maven
Project created using com.vaadin/vaadin-archetype-application archetype
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 war-vaadin08-9.0.10.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.