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我浏览了所有@NotNull不起作用的帖子。大多数都建议缺少@Valid注解。
在我的代码中，我已经应用了它，但它仍然不起作用。
静止控制器：

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RestController;
import javax.validation.Valid;
import javax.validation.constraints.Size;

@RestController
@RequestMapping("/api")
public class UserController {

@PostMapping(value = "/{user_id}", produces = "application/json")
public ResponseEntity<CreateUserResponse> createUser (@RequestHeader(value = "correleation_id") String correlationId,
                                                              @PathVariable(name = "user_id")
                                                              @Size(max = 100) String userId,
                                                              @RequestBody @Valid CreateUserRequest createUserRequest) {

      CreateUserResponse response = myServiceCall(correlationId, userId, createUserRequest);
      return new ResponseEntity<>(response, HttpStatus.OK);
  }
}

CreateUserRequest.java

import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.validation.Valid;
import javax.validation.constraints.NotNull;

@Data
@AllArgsConstructor
@NoArgsConstructor
class CreateUserRequest {

  @NotNull(message = "name must not be empty")
  @JsonProperty("name")
  private String name;

  @NotNull(message = "user_detail must not be empty")
  @Valid
  @JsonProperty("user_detail")
  private UserDetail userDetail;
}

在请求中，如果我错过了name属性，调用仍然会转到服务方法。