matchbox-engine
· An open-source implementation to support testing and implementation of FHIR based solutions and map or
capture health data into HL7® FHIR®
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 matchbox-engine-3.3.3.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.