How to return different HttpStatus codes using Spring

Any Java Enterprise Application that manipulates responses will need to return status codes depending on the execution of the code. So, here is one of the easiest ways to return a status code without the classical numbers like 200, 404, 400, etc.

// This method returns HttpStatus.OK (200) in case a wiki page exists, or  HttpStatus.NOT_FOUND (404) otherwise
@RequestMapping(value = "/pages/get/{uuid}", method = RequestMethod.GET, produces=MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<WikiPage> getWikiPage(@PathVariable("uuid") String uuid, @RequestParam String wikiUuid){
	Boolean exists = wikiPagesService.existsWikiPage(uuid, wikiUuid);
	WikiPage page = null;
	
	if(exists){
		page = wikiPagesService.getWikiPage(uuid, wikiUuid);
		return new ResponseEntity<WikiPage>(page, HttpStatus.OK);
	}else{
			return new ResponseEntity<WikiPage>(page, HttpStatus.NOT_FOUND);
	}
}

Following is a complete list of status codes in org.springframework.http.HttpStatus enumeration, you can find more information about it in this link: http://docs.spring.io/spring/docs/3.0.x/api/org/springframework/http/HttpStatus.html.