Apache Netbeans Maven Utilities
· Apache Netbeans Maven Utilities is a set of artefacts to build and populate Apache NetBeans artefacts using Apache Maven
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 utilities-parent-1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.