webapp-runner-parent
· Lightweight Application Launcher. Launch your webapp in the most popular open source web container available with a single command.
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 webapp-runner-parent-9.0.65.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.