Apache Isis - JDK Supplemental
· Defines a module to bring in dependencies that were part of JDK 8 but
had been removed with later JDK versions.
Also brings in Jakarta EE API (@Inject, @Qualifier, ...).
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 isis-jdk-supplemental-2.0.0-M9.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.