Jakarta Servlet 6.0
· This feature enables support for HTTP Servlets written to the Jakarta Servlet 6.0 specification. You can package servlets in Jakarta EE specified WAR or EAR files. If servlet security is required, you should also configure an appSecurity feature. Without a security feature, any security constraints for the application are ignored.
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 servlet-6.0-23.0.0.8.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.