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Replace `@Controller` with `@RestController` and remove `@ResponseBody` annotations (Sonar)


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LOWMerge Without ReviewYes (Sonar)

This change makes it harder for developers to make a mistake when writing REST controllers in Spring. By marking the top level type with @RestController, it is now assumed that all the methods within it will return a Java object representing the response body. Thus, there is no need to specify, for each method, the @ResponseBody annotation.

Our changes look something like this:

-   import org.springframework.stereotype.Controller;
- import org.springframework.web.bind.annotation.ResponseBody;
+ import org.springframework.web.bind.annotation.RestController;
- @Controller
+ @RestController
public class AccountController {
- @ResponseBody
public AccountDetails viewAccount() {