Save data into multiple tables in one step - using spring boot and TestRestTemplate

I have already had a project written, but having problem in saving data to Customer and Address tables by calling TestRestTemplate.PostForEntity() in the ShippingAddressControllerRestTemplateTest.java class.
A database schema (delivery.db) is also given for Mysql.
Please download the project file and delivery.db install it in your local
After unpacked my project, execute the following command:
1. cd dorinca-rest-client/
2. ./mvn-go.sh (un linux or unix)
3. cd dorinca-rest/
4. mvn test
(Note, please have the development environment setup if you don't have eg. Jdk 1.8, Mysql)