i2b2 Export Package
· A project to package up for distribution both pieces of the i2b2 data export plugin: the Javascript front-end and the corresponding Java web service.
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 i2b2-export-package-1.1-Alpha-9.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.