Ninja-standalone updates test failed to commit data into database

[greenlaw110]

OS (Please include kernel version)

Linux mint 18
4.13.0-32-generic #35~16.04.1-Ubuntu SMP
x86_64 x86_64 x86_64

Expected Behavior

Updates test committed the changed world record into database

Actual Behavior

The changed world record did not committed into database

Steps to reproduce behavior

1. Run ninja-standalone on local server with script setup.sh
2. send a request to http://localhost:8080/update
   It will print out a world record including id and randomNumber
   Open mysql client and type SELECT * FROM hello_world.world where id = <the id printed>, verify if the randomNumber selected from database is the same as the app returned.

Other details and logs

The commit #9627 changed @Transactional into @ninja.jpa.UnitOfWork, where the UnitOfWork source code says: