Fences
· Augments Java's access control by checking that a Maven Project and all its
dependencies conform to a policy that specifies which classes/packages can
link to which others.
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 fences-1.9-beta.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.