Springfox swagger ApiModelProperty值未在对象上显示

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.9.2</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.9.2</version>
</dependency>

@Configuration
@EnableSwagger2
public class SwaggerConfig {
    @Bean
    public Docket api() {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.example.controller"))
                .paths(PathSelectors.any())
                .build()
                .apiInfo(apiInfo());
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("API文档")
                .description("这是一个示例API文档")
                .version("1.0")
                .build();
    }
}

public class User {
    @ApiModelProperty(value = "用户ID", example = "1")
    private Long id;

    @ApiModelProperty(value = "用户名", example = "John")
    private String username;

    // 省略其他字段的定义和Getter/Setter方法
}