Basic Java Archetype - The Practical Developer
· A basic Java Archetype for Java 1.8 and 9. It contains some
commonly-used test libraries and creates an executable JAR file by default.
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 archetype-java-basic-tpd-1.0.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.