springdoc-openapi: How to add example of POST request?

Have the following method of Controller:

    @ApiResponses(value = {@ApiResponse(responseCode = "200")})
    @GetMapping(value = API_URI_PREFIX + PRODUCTS_URI, produces = MediaType.APPLICATION_JSON_VALUE)
    @ResponseStatus(HttpStatus.OK)
    public Flux<Product> getProducts(@Valid @NotNull PagingAndSorting pagingAndSorting) {
   }

I need to find a way how to show in Swagger example of PagingAndSorting object.

I am using springdoc-api v1.4.3.

You can use @ExampleObject annotation.

Note that you can also in the examples use the ref @ExampleObject(ref="..."), if you want to reference an sample existing object. Or ideally, fetch the examples from external configuration file and add them using OpenApiCustomiser, like it's done in this test:

• https://github.com/springdoc/springdoc-openapi/blob/master/springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/app90/SpringDocTestApp.java

Here is sample code using @ExampleObject:

@PostMapping("/test/{id}")
public void testme(@PathVariable("id") String id, @RequestBody(content = @Content(examples = {
		@ExampleObject(
				name = "Person sample",
				summary = "person example",
				value =
						"{\"email\": test@gmail.Com,"
								+ "\"firstName\": \"josh\","
								+ "\"lastName\": \"spring...\""
								+ "}")
})) PersonDTO personDTO) { }

If you are using the @RequestBody Spring annotation in the controller you need to differentiate the two, for example by using @io.swagger.v3.oas.annotations.parameters.RequestBody for the Swagger annotation. This prevents the null param problem mentioned in the comments below.

@ExampleObject can be used for @RequestBody and @ApiResponse to add examples for springdoc openapi : https://github.com/springdoc/springdoc-openapi/blob/master/springdoc-openapi-javadoc/src/test/java/test/org/springdoc/api/app90/HelloController.java

@RestController
public class HelloController {
/**
* Test 1.
*
* @param hello the hello
*/
@GetMapping("/test")
@ApiResponses(value = { @ApiResponse(description = "successful operation",content = { @Content(examples = @ExampleObject(name = "500", ref = "#/components/examples/http500Example"), mediaType = "application/json", schema = @Schema(implementation = User.class)), @Content(mediaType = "application/xml", schema = @Schema(implementation = User.class)) }) })
public void test1(String hello) {
}
/**
* Test 2.
*
* @param hello the hello
*/
@PostMapping("/test2")
@RequestBody(
description = "Details of the Item to be created",
required = true,
content = @Content(
schema = @Schema(implementation = User.class),
mediaType = MediaType.APPLICATION_JSON_VALUE,
examples = {
@ExampleObject(
name = "An example request with the minimum required fields to create.",
value = "min",
summary = "Minimal request"),
@ExampleObject(
name = "An example request with all fields provided with example values.",
value = "full",
summary = "Full request") }))
public void test2(String hello) {
}
}

if you want to add OpenApiCustomiser in order to load your examples from resources you will need to start with something like this:
https://github.com/springdoc/springdoc-openapi/blob/master/springdoc-openapi-javadoc/src/test/java/test/org/springdoc/api/app90/SpringDocTestApp.java

@Bean
public OpenApiCustomiser openApiCustomiser(Collection<Entry<String, Example>> examples) {
return openAPI -> {
examples.forEach(example -> {
openAPI.getComponents().addExamples(example.getKey(), example.getValue());
});
};
}

For header, cookie, query or path params you can use @Parameter: https://docs.swagger.io/swagger-core/v2.0.0-RC3/apidocs/io/swagger/v3/oas/annotations/Parameter.html

with ParameterIn enum: https://docs.swagger.io/swagger-core/v2.0.0/apidocs/io/swagger/v3/oas/annotations/enums/ParameterIn.html

e.g.

@Parameter(in = ParameterIn.PATH, name = "id", description="Id of the entity to be update. Cannot be empty.",
required=true, examples = {@ExampleObject(name = "id value example", value = "6317260b825729661f71eaec")})

Another way is to add @Schema(type = "string", example = "min") on your DTO. e.g. : https://www.dariawan.com/tutorials/spring/documenting-spring-boot-rest-api-springdoc-openapi-3/

If someone is still interested, this is how examples can be added programmatically to a specific endpoint:

@Bean
public OpenApiCustomiser mockExamples() {
return openAPI ->
getRequestBodyContent(openAPI, PXL_MOCK_PATH + "/transactions", "application/json").ifPresent(request ->
Arrays.stream(PxlMockCase.values()).forEach(mockCase -> {
request.addExamples(
mockCase.name(),
new Example()
.description(mockCase.getDescription())
.value(TransactionCodeRequest.builder().accountId(mockCase.getAccountId()).workflowId(15).build())
);
}));
}
private Optional<MediaType> getRequestBodyContent(OpenAPI api, String path, String bodyType) {
return Optional.ofNullable(api.getPaths())
.map(paths -> paths.get(path))
.map(PathItem::getPost)
.map(Operation::getRequestBody)
.map(RequestBody::getContent)
.map(content -> content.get(bodyType));
}

If we are using spring boot, to add it to our Maven project, we need a dependency in the pom.xml file.

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

<!-- -->

@Configuration
@EnableSwagger2
public class SpringConfig {                                    
@Bean
public Docket api() { 
return new Docket(DocumentationType.SWAGGER_2)  
.select()                                  
.apis(RequestHandlerSelectors.any())              
.paths(PathSelectors.any())                          
.build();                                           
}
}

Configuration Without Spring Boot

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("swagger-ui.html")
.addResourceLocations("classpath:/META-INF/resources/");
registry.addResourceHandler("/webjars/**")
.addResourceLocations("classpath:/META-INF/resources/webjars/");
}

Verify:
To verify that Springfox is working, you can visit the following URL in your browser:
http://localhost:8080/our-app-root/api/v2/api-docs

To use Swagger UI, one additional Maven dependency is required:

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

You can test it in your browser by visiting http://localhost:8080/our-app-root/swagger-ui.html