Using the persistence layer in the service layer

In this section, we will learn how to use the persistence layer in the service layer to store data and retrieve data from a database. We will go through the following steps:

1. Log the database connection URL.
2. Add new APIs.
3. Use the persistence layer.
4. Declare a Java bean mapper.
5. Update the service tests.

Log the database connection URL

When scaling up the number of microservices where each microservice connects to its own database, I find myself, from time to time, in a situation where I'm not sure what database each microservice actually uses. Therefore, I usually add a log statement directly after the startup of a microservice that logs the connection URL that is used to connect...