JDO PARENT
· The Java Data Objects (JDO) API is a standard interface-based
Java model abstraction of persistence, developed as Java Specification
Requests (JSR 12 and 243) under the auspices of the Java Community Process.
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 parent-pom-3.2.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.