Replace @Controller/@ResponseBody with shorter @RestController

README.ftl.md

 
     <@snippet path="src/main/java/hello/HelloController.java" prefix="initial"/>
     
-The class is flagged as a `@Controller`, meaning it's ready for use by Spring MVC to handle web requests. `@RequestMapping` maps `/` to the `index()` method. When invoked from a browser or using curl on the command line, the method returns pure text thanks to the `@ResponseBody` annotation.
+The class is flagged as a `@RestController`, meaning it's ready for use by Spring MVC to handle web requests. `@RequestMapping` maps `/` to the `index()` method. When invoked from a browser or using curl on the command line, the method returns pure text. That's because `@RestController` combines `@Controller` and `@ResponseBody`, two annotations that results in web requests returning data rather than a view.
 
 Create an Application class
 ---------------------------
 Create a new file called **app.groovy** and put the following code in it:
 
 ```groovy
-@Controller
+@RestController
 class ThisWillActuallyRun {
 
     @RequestMapping("/")
-    @ResponseBody
     String home() {
         return "Hello World!"
     }

README.md

 ```java
 package hello;
 
-import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.ResponseBody;
 
-@Controller
+@RestController
 public class HelloController {
     
     @RequestMapping("/")
-    public @ResponseBody String index() {
+    public String index() {
         return "Greetings from Spring Boot!";
     }
     
 }
 ```
     
-The class is flagged as a `@Controller`, meaning it's ready for use by Spring MVC to handle web requests. `@RequestMapping` maps `/` to the `index()` method. When invoked from a browser or using curl on the command line, the method returns pure text thanks to the `@ResponseBody` annotation.
+The class is flagged as a `@RestController`, meaning it's ready for use by Spring MVC to handle web requests. `@RequestMapping` maps `/` to the `index()` method. When invoked from a browser or using curl on the command line, the method returns pure text. That's because `@RestController` combines `@Controller` and `@ResponseBody`, two annotations that results in web requests returning data rather than a view.
 
 Create an Application class
 ---------------------------
 Create a new file called **app.groovy** and put the following code in it:
 
 ```groovy
-@Controller
+@RestController
 class ThisWillActuallyRun {
 
     @RequestMapping("/")
-    @ResponseBody
     String home() {
         return "Hello World!"
     }

complete/src/main/java/hello/HelloController.java

 package hello;
 
-import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.ResponseBody;
 
-@Controller
+@RestController
 public class HelloController {
     
     @RequestMapping("/")
-    public @ResponseBody String index() {
+    public String index() {
         return "Greetings from Spring Boot!";
     }
     

initial/src/main/java/hello/HelloController.java

 package hello;
 
-import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.ResponseBody;
 
-@Controller
+@RestController
 public class HelloController {
     
     @RequestMapping("/")
-    public @ResponseBody String index() {
+    public String index() {
         return "Greetings from Spring Boot!";
     }