BOM to capture all standard controller service APIs and utils we want to make readily available to any nars that want to
leverage this common managed set of dependencies
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 nifi-standard-services-api-bom-2.0.0-M3.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.