esc-parent
· Defines a common event store Java interface and provides some adapters (like for Greg Young's event store) and implementations (like in-memory or file-based).
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 esc-parent-0.4.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.