io.github.belgif.rest.problem:belgif-rest-problem-parent
· Java library for RFC 9457 Problems with support for standard problem types of the Belgif REST guide
(https://www.belgif.be/specification/rest/api-guide/#error-handling).
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 belgif-rest-problem-parent-0.1.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.
