Hibernate Search
· Hibernate Search transparently indexes your objects and offers fast regular, full-text and geolocation search. Ease of use and easy clustering are core.
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 hibernate-search-2018.5.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.