Cassandra Reaper project
· Reaper is a centralized, stateful, and highly configurable tool for running Apache Cassandra repairs against single or multi-site clusters
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 cassandra-reaper-pom-2.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.