Apache Sling System Bundle Extension: Java Transaction API
· Adds the javax.transaction and javax.transaction.xa
packages to the system bundle exports.
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.apache.sling.fragment.transaction-1.0.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.