JGit Build Number Plugins For Maven And Ant
· Maven plugin and Ant task, extract buildnumbers from project's Git repository without Git command line tool
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 jgit-buildnumber-parent-1.2.12.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.