Editing SpringBoot (section)

===Rest Controller===
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController
 @CrossOrigin(origins="http://localhost:4200") // avoid cross origin errors in browser
 [[SpringBoot#.40RequestMapping|@RequestMapping]]("xyz")
 public class HelloWorldController 
 {
   // @RequestMapping(method=RequestMethod.GET, path="/hello-world")
   @GetMapping(path="/hello-world")
   @JsonView(MenuView.NodeView.class) // tells Jackson to propagate the view class to the entities for [[Glossary#JSON|json]]-fication the return value
                                      // the same annotation has to be used at attributes in the JPA entities, which should be used for this view
   public <METHOD>() {
     ...
   }

====@RequestMapping====
 import org.springframework.web.bind.annotation.RequestMapping;
 
 @RequestMapping("xyz") // no need of backslash, all URLs of the mappings have the prefix 'xyz', method mappings need to include the / after the prefix e.g. http://localhost/xyz/do_something
 public class XYZControler {
   @GetMapping("/do_something")
   public void doSomething() {
   ...

====@ResponseBody====
The <code>@ResponseBody</code> annotation tells a controller that the object returned is automatically serialized into JSON and passed back into the HttpResponse object. There is no need to annotate the <code>@RestController</code>-annotated controllers with the <code>@ResponseBody</code> annotation since Spring does it by default.

====Method Return Values====
 public User <METHOD> 
 public ResponseEntity<User> <METHOD> // is the same as above