Spring API @RequestParam Input conversion

Question

I am creating a method for an API. In this method i have some parameters that are optional. those are filters for searching an event. when i try to run it and type the following url:

http://localhost:8181/api/events?id=gRDHzDh9TdiLDAZgrZc2wg==

i get this error message:

Failed to convert value of type 'java.lang.String' to required type 'java.util.UUID'; nested exception is java.lang.IllegalArgumentException: Invalid UUID string: gRDHzDh9TdiLDAZgrZc2wg==

So i understand that i insert a String in my url and expect a UUID in code, but how do i convert this? Below here is my code:

@RequestMapping(
            method = RequestMethod.GET,
            produces = MediaType.APPLICATION_JSON_VALUE
    )
    public ResponseEntity getEvents(@RequestParam(value = "id", required = false) UUID eventId,
                                    @RequestParam(value = "title", required = false) String title,
                                    @RequestParam(value = "playtype", required = false) PlayType playType,
                                    @RequestParam(value = "skilllevel", required = false) SkillLevel skillLevel,
                                    @RequestParam(value = "sporttype", required = false) SportType sportType,
                                    @RequestParam(value = "long", required = false) String _long,
                                    @RequestParam(value = "lat", required = false) String lat) {
        try {
            List<Event> events = eventService.getEvents(eventId, title, playType, skillLevel, sportType, _long, lat);
            if (events.size() == 0) {
                return new ResponseEntity("No events found", HttpStatus.OK);
            }
            return new ResponseEntity(events, HttpStatus.OK);
        } catch (Exception ex){
            return new ResponseEntity(ex.getMessage(), HttpStatus.BAD_REQUEST);
        }
    }

So here are my 2 questions:

1. How do i convert the string to a valid UUID input in the RequestParam?

2. How do i convert the string to a valid enum in the RequestParam? (because with the enums i have the same error)

EDIT

my code is now like this:

@RequestMapping(
        method = RequestMethod.GET,
        produces = MediaType.APPLICATION_JSON_VALUE
)
public ResponseEntity getEvents(@RequestParam(value = "id", required = false) String eventId,
                                @RequestParam(value = "title", required = false) String title,
                                @RequestParam(value = "playtype", required = false) String playType,
                                @RequestParam(value = "skilllevel", required = false) String skillLevel,
                                @RequestParam(value = "sporttype", required = false) String sportType,
                                @RequestParam(value = "long", required = false) String _long,
                                @RequestParam(value = "lat", required = false) String lat) {
    UUID id = null;
    PlayType playType1 = null;
    SkillLevel skillLevel1 = null;
    SportType sportType1 = null;
    try {
        if (eventId != null){
            id = UUID.fromString(eventId);
        }
        if (playType != null){
            playType1 = PlayType.valueOf(playType);
        }
        if (skillLevel != null){
            skillLevel1 = SkillLevel.valueOf(skillLevel);
        }
        if (sportType != null){
            sportType1 = SportType.valueOf(sportType);
        }
        List<Event> events = eventService.getEvents(id, title, playType1, skillLevel1, sportType1, _long, lat);
        if (events.size() == 0) {
            return new ResponseEntity("No events found", HttpStatus.OK);
        }
        return new ResponseEntity(events, HttpStatus.OK);
    } catch (Exception ex){
        return new ResponseEntity(ex.getMessage(), HttpStatus.BAD_REQUEST);
    }
}

but i still get an error:

Invalid UUID string: gRDHzDh9TdiLDAZgrZc2wg==

Answer 1

1. How do I convert the string to a valid UUID input?

You need to use UUID.fromString() API, see here

2. How do i convert the string to a valid enum?

You need to use Enum.valueOf() API, see here