Download org.wso2.carbon.identity.outbound.auth.sts.passive : org.wso2.carbon.identity.application.authenticator.passive.sts.server.feature JAR file - All Versions:
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.application.authenticator.passive.sts.server.feature-5.5.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.