Tokamak
· A stateless Spring Boot JWT Authentication and OAuth2 Authorization Server, with RESTful interfaces to create and manage MySQL-backed clients and resource owners.
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 tokamak-1.0.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.