WSO2 Carbon User Account Association Server Feature
· This feature contains the core bundles required for Back-end user account association functionality
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 org.wso2.carbon.identity.user.account.association.server.feature-5.5.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.