Spring boot validation not validating @RequestBody

Question

Validation does not kick in when posting to RestController. Very simple application setup with springboot-starter-validation added to build.gradle. Code is written in Groovy.

Entitiy to be validated:

@Entity
@Table(name = "event")
class Event extends Base {

    @Column(nullable = false, unique = true)
    @NotBlank
    String name
}

Controller:

@RestController
class ApiController {

    @Autowired
    EventService eventService

    @PostMapping("/api/event")
    Event createEvent(@Valid @RequestBody Event event) {
        eventService.save(event)
    }
}

When posting simple json: {"name": ""}to the endpoint "/api/event" I would expect that Spring would throw MethodArgumentNotValidException but the entity is saved with "" as a value for name. Adding BindingResult as parameter to createEvent yield 0 binding errors.

I must be missing something. But I can't spot what it is. Can you? :)

In my trial-and-error frenzy I tried that - even though it should not be necessary... The @Validated annotation is validation groups... It did not do the trick.. :) — Hoof
– Hoof, Commented Jan 11, 2022 at 21:27
@EnableWebMvc ? (which is equivalent to DIY/disables "auto configuration" ..in spring-boot!) — xerx593
– xerx593, Commented Jan 12, 2022 at 2:32
I have not explicitely stated @EnableWebMvc as I have springboot-starter-web as a dependecy as well... (And I would rather go with autoconfiguration all the way - or so is my thougt, but....) — Hoof
– Hoof, Commented Jan 12, 2022 at 12:17
no, bud, absolutely "cannot reproduce"/works like charm: github.com/xerx593/vaildation-groovy-demo (starter used) — xerx593
– xerx593, Commented Jan 12, 2022 at 15:21

user10260739 · Accepted Answer · 2022-01-12 02:25:10Z

1

I tried the same with spring-boot-starter-validation in the Maven environment and it is working fine. On giving {"name": ""} it throws MethodArgumentNotValidException.

{
    "timestamp": "2022-01-12T02:20:21.059+00:00",
    "status": 400,
    "error": "Bad Request",
    "trace": ......,
    "message": "Validation failed for object='event'. Error count: 1",
    "errors": [
        {
            "codes": [
                "NotBlank.event.name",
                "NotBlank.name",
                "NotBlank.java.lang.String",
                "NotBlank"
            ],
            "arguments": [
                {
                    "codes": [
                        "event.name",
                        "name"
                    ],
                    "arguments": null,
                    "defaultMessage": "name",
                    "code": "name"
                }
            ],
            "defaultMessage": "must not be blank",
            "objectName": "event",
            "field": "name",
            "rejectedValue": "",
            "bindingFailure": false,
            "code": "NotBlank"
        }
    ],
    "path": "/api/event"
}

answered Jan 12, 2022 at 2:25

user10260739

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3 Comments

Hoof Over a year ago

Exact same source code?

user10260739 Over a year ago

The controller is exactly the same. In entity, you have a parent class, but I declared an id variable in the Event class itself for the primary key and it doesn't have a parent class.

Hoof Over a year ago

Tried using a non-entity class for the sake of debugging. Added a EventFormObject with a single attribute String name with @NotBlank annotation. Result is the same - no validation kicks in...

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