Apache Directory Project
· The Apache Directory Project provides directory solutions entirely written in Java. These include a directory server, which has been certified as LDAP v3 compliant
by the Open Group (Apache Directory Server), and Eclipse-based directory tools (Apache Directory Studio).
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 project-47.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.