OSGi Java Persistence API 1.0
· This feature is superseded by the blueprint-1.0 and jpa-2.0 features. When those features are both added to the server, this feature is added automatically.
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.jpa-1.0-23.0.0.8.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.