Maven JDepend Plugin
· JDepend traverses Java class file directories and generates design quality metrics for each Java package. JDepend allows you to automatically measure the quality of a design in terms of its extensibility, reusability, and maintainability to manage package dependencies effectively.
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 maven-jdepend-plugin-1.6.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.