@ControllerRest

this annotation will basically catch an exception that extends DefaultExceptionRest and overrides the response by modifying the following attributes:

• http code: 500
• content body:json below

---

{
    "message": "Exception message"
} 

---

The controller:

---

@ControllerRest
public class IndexController {

	@Inject
	private Result result;
	
	@Inject
	private ClientService clientService;

	@Path("/")	
	public void index() {
		result.use( Results.json() ).from(clientService.createClient()).serialize();
	}
}

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the code with business rule:

---

public class ClientService {

	public Client createClient() throws DefaultExceptionRest {
		
		if( true ) {
			throw new DefaultExceptionRest("error to create new Client");
		}
		
		Client client = new Client();
		client.setName("Mattheus");
		client.setAddress("rua e 27");
		
		return client;
	}
	
	public Client createClientOld() throws BusinessException {
	
		if( true ) {
			throw new BusinessException("Problem creating Client Old");
		}
		
		Client client = new Client();
		client.setName("Nicolas");
		client.setAddress("rua e 28");
		
		return client;
		
	}
	
}

---

BusinessException:

---

public class BusinessException extends DefaultExceptionRest {

	private static final long serialVersionUID = 1L;
	
	public BusinessException(String message) {
		super(message);
	}
}

---

A clean code, no exceptions handling in controller