ChocolateController

@Grab(group='org.codehaus.jackson', module='jackson-mapper-asl', version='1.9.13')

@Controller
@RequestMapping("/chocolates")
class ChocolateController {
  def chocolates = [
		[ id: 1, name: "Lindt", percentage: "70%" ],
		[ id: 2, name: "Liedl", percentage: "15%" ]
	]

	@RequestMapping
	@ResponseBody
	def getAll() {
		chocolates
	}

	@RequestMapping("/{id}")
	@ResponseBody
	def get(@PathVariable long id) {
		def chocolate = chocolates.find { it.id == id }
		if(chocolate == null) {
			throw new ResourceNotFoundException(resourceId: id)
		}
		chocolate
	}

	@ExceptionHandler(ResourceNotFoundException)
	@ResponseBody
	def onResourceNotFound(def exception) {
		[ code : 404, id : exception.resourceId ]
	}
}

@ResponseStatus(value=HttpStatus.NOT_FOUND)
class ResourceNotFoundException extends RuntimeException {
	def resourceId
}