transit-clj
· Transit is a data format and a set of libraries for conveying
values between applications written in different languages. This library
provides support for marshalling Transit data to/from Clojure.
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 transit-clj-1.0.333.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.