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 OSGi_R4_v4.1_cmpn_root-4.1.0.build-200702212030.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.