kotlin data (corresponding to java entity class)
@Entity
@Table(name = "user")
data class User(
@NotNull(message = "User name cannot be empty")
@Column(name = "user_name", nullable = false)
var userName: String = "",
@NotNull(message = "user ID Can not be empty")
@Column(name = "user_id", unique = true)
var userId: String = "",
@Email(message = "Invalid mailbox")
var email: String = "",
@Column(nullable = false)
var password: String = ""
) : Serializable Look at controller again
@RestController
@RequestMapping("/user")
class UserController {
@Autowired lateinit var userRepository: UserRepository
@PutMapping(value = "/put",
consumes = arrayOf(MediaType.APPLICATION_JSON_UTF8_VALUE))
@ResponseBody
fun put(@Valid @RequestBody user: SysUser):
ResponseEntity<SysUser>? {
if (result.hasErrors()) {
val fieldErrors = result.fieldErrors
for (fieldError in fieldErrors) {
println("${fieldError.defaultMessage}")
}
return fieldErrors
}
println(user)
return ResponseEntity
.ok()
.cacheControl(CacheControl.maxAge(30, TimeUnit.DAYS))
.eTag("AC")
.body(user)
}
}Invoke put method, @Valid check is invalid
Reason analysis:
In java, validation is annotated on entity class attributes or get/set methods, but in kotlin, attributes are written directly in constructors, and validation annotations do not work on attributes.
Solution:
Using the @field: identifier, the field identifier is only allowed in the accessor function of the property. It can validate annotation functions and attributes.
Modify the kotlin data class slightly:
@Entity
@Table(name = "user")
data class User(
@field:NotNull(message = "User name cannot be empty")
@Column(name = "user_name", nullable = false)
var userName: String = "",
@field:NotNull(message = "user ID Can not be empty")
@Column(name = "user_id", unique = true)
var userId: String = "",
@field:NotBlank(message = "Mailbox cannot be empty")
@field:Email(message = "Invalid mailbox")
var email: String = "",
@field:NotBlank(message = "Password cannot be empty")
@Column(nullable = false)
var password: String = ""
) : Serializable After that, @Valid check will work properly.
Re execution
curl -v http://localhost:8080/user/putSee the error message
{
"timestamp": "2017-03-04 13:54:19",
"status": 400,
"error": "Bad Request",
"exception": "org.springframework.web.bind.MethodArgumentNotValidException",
"errors": [
{
"field": "userId",
"rejectedValue": null,
"bindingFailure": false,
"objectName": "sysUser",
"codes": [
"NotNull.sysUser.userId",
"NotNull.userId",
"NotNull.java.lang.String",
"NotNull"
],
"arguments": [
{
"codes": [
"sysUser.userId",
"userId"
],
"arguments": null,
"defaultMessage": "userId"
}
],
"defaultMessage": "user ID Can not be empty"
}
],
"message": "Validation failed for object='sysUser'. Error count: 1",
"path": "/user/put"
}