Java Transaction API
· The javax.transaction package. JTA specifies standard Java interfaces between a transaction manager and the parties involved in a distributed transaction system: the resource manager, the application server, and the transactional applications.
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 jta-1.0.1b.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.