Add suppress warning annotation for REST controllers.

src/main/java/org/cerberus/controllers/ApplicationController.java

@@ -17,6 +17,7 @@ import static org.cerberus.core.constant.RoleSecurity.MAINTAINER;
 
 @RestController
 @RequestMapping("/api/applications")
+@SuppressWarnings("unused")
 public class ApplicationController {
     private ApplicationService service;
     private SecurityService securityService;

src/main/java/org/cerberus/controllers/ConfigurationFileController.java

@@ -16,6 +16,7 @@ import static org.cerberus.core.constant.RoleSecurity.MAINTAINER;
 
 @RestController
 @RequestMapping("/api/applications/{applicationId}/configurationFile")
+@SuppressWarnings("unused")
 public class ConfigurationFileController {
     private ConfigurationFileService service;
     private SecurityService securityService;

src/main/java/org/cerberus/controllers/RobotsTxtController.java

@@ -9,6 +9,7 @@ import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 @RestController
+@SuppressWarnings("unused")
 public class RobotsTxtController {
 
     private static final Logger LOG = LoggerFactory.getLogger(RobotsTxtController.class);

src/main/java/org/cerberus/controllers/UserController.java

@@ -15,6 +15,7 @@ import static org.springframework.http.HttpStatus.NO_CONTENT;
 
 @RestController
 @RequestMapping("/api/users")
+@SuppressWarnings("unused")
 public class UserController {
     private UserService service;