Question 59343 in Telegram API Question posted in
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How to Use DI to get a final variable as @PostMapping's path – Telegram API

I have a final class Constants, which holds some final data.

@Component
public final class Constants {
    public final String TOKEN;
    public final String HOST;
    public final String TELEGRAM;

    public Constants(@Value("${myapp.bot-token}") String token,
                     @Value("${myapp.host}") String host) {
        this.TOKEN = token;
        this.HOST = host;
        this.TELEGRAM = "https://api.telegram.org/bot" + TOKEN;
    }

}

The problem is that, when I want to use a variable as @PostMapping path, I faced this error:

Attribute value must be constant

@RestController
@RequestMapping
public class Controller {

    private final Constants constants;

    @Autowired
    public Controller(Constants constants) {
        this.constants = constants;
    }

    @PostMapping(constants.TOKEN)// Problem is here
    public ResponseEntity<?> getMessage(@RequestBody String payload) {
        return new ResponseEntity<HttpStatus>(HttpStatus.OK);
    }

}

I’ve tried to load TOKEN in my controller class but faced the same issue.

@RestController
@RequestMapping
public class Controller {

    @Value("${myapp.bot-token}") String token
    private String token;

    @PostMapping(token)// Problem is here
    public ResponseEntity<?> getMessage(@RequestBody String payload) {
        return new ResponseEntity<HttpStatus>(HttpStatus.OK);
    }

}

When I do something like this the problem will gone. But I don’t want to declare my token in source-code.

@RestController
@RequestMapping
public class Controller {

    private final String TOKEN = "SOME-TOKEN";

    @PostMapping(TOKEN)// No problem
    public ResponseEntity<?> getMessage(@RequestBody String payload) {
        return new ResponseEntity<HttpStatus>(HttpStatus.OK);
    }

}

Can anyone please give me a solution to this?

Tags:

2

Answers


  1. 0

    Try to paste string with property path inside @PostMapping annotation. Like this

    @GetMapping(value = "${app.path}")
public String hello() {
    return "hello";
}
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  2. 0

    1. You can only use a constant (i.e. a final static variable) as the parameter for an annotation.

      Example:

      @Component
class Constants {
    public final static String FACEBOOK = "facebook";
}

@RestController
class Controller {
    @PostMapping(Constants.FACEBOOK) 
    public ResponseEntity<ResponseBody> getMessage(@RequestBody String payload) {
        return new ResponseEntity<>(HttpStatus.OK);
    }
}

    2. You must use builder pattern(use Lombok for ease) and freeze the value that you are getting from the properties and then use that in your program.

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