Creating REST controllers

Before we create the frontend of our refactored application, we need to create controllers to expose our functionality as REST/JavaScript Object Notation (JSON) services. To accomplish this, we have created a new project called banking-rest. This lays the foundation for refactoring to microservices.

Let's examine our account controller. We have an interface called AccountController, as shown in the following code block:

AccountController.java

public interface AccountController {
     ResponseEntity<?> depositFunds(final UUID id, final DepositBean deposit, final User user);
     ResponseEntity<?> getAccount(final UUID id, final User user);
     ResponseEntity<?> getAccounts(final User user);
     ResponseEntity<?> getBalance(final UUID id, final User user);
     ResponseEntity<?> getDeposit...