Setup System:

1. Use docker-compose to setup the TrainTicket system.
2. Log in and make sure that there is at least one ticket order that fits the following:
   (1) The train number is start with Z or K.
   (2) The order status is PAID.


Failure Triggering Usage Steps:

1. Click [Admin Management] and login with admin account.
2. Enter "Shang Hai" and "Nan Jing" into the two input box at the upper right part of page.
3. Click [Search And Lock].
4. Return to the index page and login.
5. Click [Flow Two - Ticket Cancel & Ticket Change].
6. Click [All Orders Async].
7. Click [Refresh Orders].
8. Select the order mentioned above and click [Cancel Order].
9. You will get [Error] alert and see the exception logs on the server console.


Failure Triggering Test Case:

There are two test cases in ts-ui-test, named [TestFlowFail.java] and [TestFlowSuccess.java] .
Run [TestFlowFail.java] will reproduce the fault.
Run [TestFlowSuccess.java] won't trigger the fault.