Springfox Java Bean Validations not displaying in Swagger Output - spring-boot

Question

I'm trying to follow the documentation for Springfox Swagger to get Java Bean Validation to work (http://springfox.github.io/springfox/docs/current/#springfox-support-for-jsr-303), but they are not showing up in the Swagger UI.
This is my Spring Configuration:
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
#EnableSwagger2
#Import({springfox.bean.validators.configuration.BeanValidatorPluginsConfiguration.class})
#Configuration
public class SwaggerConfig {
#Bean
public Docket docket() {
return new Docket(DocumentationType.SWAGGER_2)
.apiInfo(apiInfo())
.select()
.build();
}
private ApiInfo apiInfo() {
return new ApiInfoBuilder()
.title("My API")
.build();
}
}
This is my request mapping:
#ApiOperation(value = "Use to get token for internal applications")
#PostMapping(value = AuthUris.TOKEN)
public AuthResponse token(#Valid #RequestBody AuthRequest authRequest) {
// implementation omitted
}
This is my POJO:
#ApiModel
public class AuthRequest {
#ApiModelProperty
#NotNull
#Size(min = 4, max = 50)
private String username;
#NotNull
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
I expected the NotNull and Size annotations to be captured in the Swagger UI but they are not. Please help me understand how this should work. Thank you.
.
So thanks to https://stackoverflow.com/users/8012379/indra-basak I do see that they were working. However, I have to hover over the field to thinks like #Size. See the screenshot below.

Answer 1

If you are using springfox version 2.7.0, both #NotNull and #Size annotations should work.
Your #NotNull annotation is already working in the password field.
If #ApiModelProperty annotation is present for a field, it takes precedence over #NotNull annotation. It is the case with the username field. It shows up as optional because the required attribute of #ApiModelProperty annotation is set to false by default.
If you use springfox version 2.7.0 and don't use #ApiModelProperty annotation, the model will show up as:
Validation
For example, if you enter a username less than the minimum size of 4, you will get the following exception:
{
"timestamp": 1511550365198,
"status": 400,
"error": "Bad Request",
"exception": "org.springframework.web.bind.MethodArgumentNotValidException",
"errors": [
{
"codes": [
"Size.authRequest.username",
"Size.username",
"Size.java.lang.String",
"Size"
],
"arguments": [
{
"codes": [
"authRequest.username",
"username"
],
"arguments": null,
"defaultMessage": "username",
"code": "username"
},
50,
4
],
"defaultMessage": "size must be between 4 and 50",
"objectName": "authRequest",
"field": "username",
"rejectedValue": "s",
"bindingFailure": false,
"code": "Size"
}
],
"message": "Validation failed for object='authRequest'. Error count: 1",
"path": "/tokens"
}