Spring cloud openFeign can't create dynamic query parameters. It throws below exception because SpringMvcContract tries to find the RequestParam value attribute which doesn't exist.
java.lang.IllegalStateException: RequestParam.value() was empty on parameter 0
#RequestMapping(method = RequestMethod.GET, value = "/orders")
Pageable<Order> searchOrder2(#RequestParam CustomObject customObject);
I tried using #QueryMap instead of #RequestParam but #QueryMap does not generate query parameters.
Btw #RequestParam Map<String, Object> params method parameter works fine to generate a dynamic query parameter.
But I want to use a custom object in which the feign client can generate dynamic query parameters from the object's attributes.
From Spring Cloud OpenFeign Docs:
Spring Cloud OpenFeign provides an equivalent #SpringQueryMap annotation, which is used to annotate a POJO or Map parameter as a query parameter map
So your code should be:
#RequestMapping(method = RequestMethod.GET, value = "/orders")
Pageable<Order> searchOrder2(#SpringQueryMap #ModelAttribute CustomObject customObject);
spring-cloud-starter-feign has a open issue for supporting pojo object as request parameter. Therefore I used a request interceptor that take object from feign method and create query part of url from its fields. Thanks to #charlesvhe
public class DynamicQueryRequestInterceptor implements RequestInterceptor {
private static final Logger LOGGER = LoggerFactory.getLogger(DynamicQueryRequestInterceptor.class);
private static final String EMPTY = "";
#Autowired
private ObjectMapper objectMapper;
#Override
public void apply(RequestTemplate template) {
if ("GET".equals(template.method()) && Objects.nonNull(template.body())) {
try {
JsonNode jsonNode = objectMapper.readTree(template.body());
template.body(null);
Map<String, Collection<String>> queries = new HashMap<>();
buildQuery(jsonNode, EMPTY, queries);
template.queries(queries);
} catch (IOException e) {
LOGGER.error("IOException occurred while try to create http query");
}
}
}
private void buildQuery(JsonNode jsonNode, String path, Map<String, Collection<String>> queries) {
if (!jsonNode.isContainerNode()) {
if (jsonNode.isNull()) {
return;
}
Collection<String> values = queries.computeIfAbsent(path, k -> new ArrayList<>());
values.add(jsonNode.asText());
return;
}
if (jsonNode.isArray()) {
Iterator<JsonNode> it = jsonNode.elements();
while (it.hasNext()) {
buildQuery(it.next(), path, queries);
}
} else {
Iterator<Map.Entry<String, JsonNode>> it = jsonNode.fields();
while (it.hasNext()) {
Map.Entry<String, JsonNode> entry = it.next();
if (StringUtils.hasText(path)) {
buildQuery(entry.getValue(), path + "." + entry.getKey(), queries);
} else {
buildQuery(entry.getValue(), entry.getKey(), queries);
}
}
}
}
}
Related
Any Help please !!
I receive this error when I'm calling my endpoint which call Feign in the background :
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of
`org.springframework.http.ResponseEntity` (no Creators, like default constructor, exist): cannot deserialize
from Object value (no delegate- or property-based Creator)
at [Source: (BufferedReader); line: 1, column: 2]
This is my endpoint inside Controller :
#RestController
#RequestMapping(Routes.URI_PREFIX)
public class CartoController {
#Autowired
private ReadCartographyApiDelegate readCartographyApiDelegate;
#GetMapping(value = "/cartographies/{uid}", produces = {MediaType.APPLICATION_JSON_VALUE})
public ResponseWrapper<ReadCartographyResponse> readCarto(HttpServletRequest request,
#PathVariable(name = "uid") String uid) {
ResponseEntity<ReadCartographyResponse> result ;
try {
result = readCartographyApiDelegate.readCartography(uid);
}catch (Exception e){
throw new TechnicalException("Error during read Carto");
}
return responseWrapperWithIdBuilder.of(result.getBody());
}
}
Interface ReadCartographyApiDelegate generated automatically by openApi from yaml file :
#javax.annotation.Generated(value = "org.openapitools.codegen.languages.SpringCodegen", date = "...")
public interface ReadCartographyApiDelegate {
default Optional<NativeWebRequest> getRequest() {
return Optional.empty();
}
default ResponseEntity<ReadCartographyResponse> readCartography(String uid) {
getRequest().ifPresent(request -> {
for (MediaType mediaType: MediaType.parseMediaTypes(request.getHeader("Accept"))) {
if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
String exampleString = "null";
ApiUtil.setExampleResponse(request, "application/json", exampleString);
break;
}
}
});
return new ResponseEntity<>(HttpStatus.NOT_IMPLEMENTED);
}
}
This my ReadCartoApiDelegateImpl which implements ReadCartographyApiDelegate interface :
#Service
public class ReadCartographyApiDelegateImpl implements ReadCartographyApiDelegate {
private EcomGtmClient ecomGtmClient;
public ReadCartographyApiDelegateImpl(EcomGtmClient ecomGtmClient) {
this.ecomGtmClient = ecomGtmClient;
}
#Override
public ResponseEntity<ReadCartographyResponse> readCartography(String uid) {
ResponseEntity<ReadCartographyResponse> response = ecomGtmClient.readCartography(uid);
return response;
}
}
This is the feign client :
#FeignClient(name = "ecomGtmSvc", url = "http://localhost/")
public interface EcomGtmClient {
#GetMapping(value = "/read-carto/{uid}")
ResponseEntity<ReadCartographyResponse> readCartography(#PathVariable("uid") String uid);
}
The problem is that ResponseEntity (spring class) class doesn't contain default constructor which is needed during creating of instance. is there Any config to resolve this issue ?
If you want access to the body or headers on feign responses, you should use the feign.Response class. ResponseEntity does not work with feign because it is not meant to. I think it is best if you just return Response from your feign client method. You should then be able to pass the body to the ResponseEntity instance in the Controller.
What is your reason to even use the response-wrapper, i can't really figure that out from your code?
Sadly I couldn't find any documentation on the Response class, but here's the link to the source on GitHub.
https://github.com/OpenFeign/feign/blob/master/core/src/main/java/feign/Response.java
My Suggestion would be
#FeignClient(name = "ecomGtmSvc", url = "http://localhost/")
public interface EcomGtmClient {
#GetMapping(value = "/read-carto/{uid}")
ReadCartographyResponse readCartography(#PathVariable("uid") String uid);
}
#RestController
#RequestMapping(Routes.URI_PREFIX)
public class CartoController {
#Autowired
private ReadCartographyApiDelegate readCartographyApiDelegate;
#GetMapping(value = "/cartographies/{uid}", produces = {MediaType.APPLICATION_JSON_VALUE})
public ResponseWrapper<ReadCartographyResponse> readCarto(HttpServletRequest request,
#PathVariable(name = "uid") String uid) {
ReadCartographyResponse result ;
try {
result = readCartographyApiDelegate.readCartography(uid);
}catch (Exception e){
throw new TechnicalException("Error during read Carto");
}
// I don't know where you get the builder from, so I assume it does something import and is needed
return responseWrapperWithIdBuilder.of(result);
}
}
Of course you'd also have to change all intermediate classes.
The Response Output was the correct Object that I have to put, cause every time I need to check the status from my feign client endpoint to do différent logic
#FeignClient(name = "ecomGtmSvc", url = "http://localhost/")
public interface EcomGtmClient {
#GetMapping(value = "/read-carto/{uid}")
ReadCartographyResponse readCartography(#PathVariable("uid") String uid);
}
I'm trying to find a more or less elegant way to handle PATCH http operations in Spring MVC.
Basically, I'd like to perform a "dual" Jackson deserialization of a JSON document from a Request Body: one to a Map, and the other to the target POJO. Ideally, I would like to perform this in a single PartialDto<T> instance, where T is my target DTO type.
Better giving an example. Let's say I currently have this PUT mapping in a REST Controller:
#PutMapping("/resource")
public MyDto updateWhole(#RequestBody MyDto dto) {
System.out.println("PUT: updating the whole object to " + dto);
return dto;
}
My idea is to build a PartialDto type that would provide both POJO representation of the request body, as well as the Map representation, like this:
#PatchMapping("/resource")
public MyDto updatePartial(#RequestBody PartialDto<MyDto> partial) {
System.out.println("PATCH: partial update of the object to " + partial);
final MyDto dto = partial.asDto();
// Do stuff using the deserialized POJO
final Map<String, Object> map = partial.asMap();
// Do stuff as a deserialized map...
return dto;
}
I hope this will allow me to further expand the PartialDto implementation so I can perform things like this:
if (partial.hasAttribute("myAttribute")) {
final String myAttribute = dto.getMyAttribute();
// ...
}
Or even using a metamodel generator:
if (partial.hasAttribute(MyDto_.myAttribute)) {
final String myAttribute = dto.getMyAttribute();
// ...
}
So the question is simple: Jackson can easily map a JSON document to a POJO. It can also easily map a JSON document to a java Map. How can I do both at the same time in a Wrapper object such as my PartialDto?
public class PartialDto<T> {
private final Map<String, Object> map;
private final T dto;
PartialDto(Map<String, Object> map, T dto) {
this.map = map;
this.dto = dto;
}
public T asDto() {
return this.dto;
}
public Map<String, Object> asMap() {
return Collections.unmodifiableMap(this.map);
}
}
I tried to use a GenericConverter like this (that, of course, I registered in Spring MVC's FormatterRegistry):
public class PartialDtoConverter implements GenericConverter {
private final ObjectMapper objectMapper;
public PartialDtoConverter(ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
}
#Override
public Set<ConvertiblePair> getConvertibleTypes() {
return Collections.singleton(new ConvertiblePair(String.class, PartialDto.class));
}
#Override
public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
final Class<?> targetClazz = targetType.getResolvableType().getGeneric(0).getRawClass();
final Map<String, Object> map;
try {
map = objectMapper.readValue((String) source, Map.class);
} catch (JsonProcessingException e) {
throw new RuntimeException(e); // FIXME
}
final Object dto = objectMapper.convertValue(map, targetClazz);
return new PartialDto(map, dto) ;
}
}
And this converter works well when tested directly using Spring's ConversionService:
#SpringBootTest
class ConverterTest {
#Autowired
private ConversionService conversionService;
#Test
public void testPartialUpdate() throws Exception {
final MyDto dto = new MyDto()
.setIt("It");
final PartialDto<MyDto> partialDto = (PartialDto<MyDto>) conversionService.convert(
"{ \"it\": \"Plop\" }",
new TypeDescriptor(ResolvableType.forClass(String.class), null, null),
new TypeDescriptor(ResolvableType.forClassWithGenerics(PartialDto.class, MyDto.class), null, null)
);
Assertions.assertEquals("Plop", partialDto.asDto().getIt());
Assertions.assertEquals("Plop", partialDto.asMap().get("it"));
}
}
However, it doesn't seem to work in a #RequestBody such as shown above. Reminder:
#PatchMapping("/resource")
public MyDto updatePartial(#RequestBody PartialDto<MyDto> partial) {
// ...
}
Any idea is welcome.
This controller
#GetMapping("temp")
public String temp(#RequestParam(value = "foo") int foo,
#RequestParam(value = "bar") Map<String, String> bar) {
return "Hello";
}
Produces the following error:
{
"exception": "org.springframework.web.method.annotation.MethodArgumentConversionNotSupportedException",
"message": "Failed to convert value of type 'java.lang.String' to required type 'java.util.Map'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'java.util.Map': no matching editors or conversion strategy found"
}
What I want is to pass some JSON with bar parameter:
http://localhost:8089/temp?foo=7&bar=%7B%22a%22%3A%22b%22%7D, where foo is 7 and bar is {"a":"b"}
Why is Spring not able to do this simple conversion? Note that it works if the map is used as a #RequestBody of a POST request.
Here is the solution that worked:
Just define a custom converter from String to Map as a #Component. Then it will be registered automatically:
#Component
public class StringToMapConverter implements Converter<String, Map<String, String>> {
#Override
public Map<String, Object> convert(String source) {
try {
return new ObjectMapper().readValue(source, new TypeReference<Map<String, String>>() {});
} catch (IOException e) {
throw new RuntimeException(e.getMessage());
}
}
}
If you want to use Map<String, String> you have to do the following:
#GetMapping("temp")
public String temp(#RequestParam Map<String, String> blah) {
System.out.println(blah.get("a"));
return "Hello";
}
And the URL for this is: http://localhost:8080/temp?a=b
With Map<String, String>you will have access to all your URL provided Request Params, so you can add ?c=d and access the value in your controller with blah.get("c");
For more information have a look at: http://www.logicbig.com/tutorials/spring-framework/spring-web-mvc/spring-mvc-request-param/ at section Using Map with #RequestParam for multiple params
Update 1: If you want to pass a JSON as String you can try the following:
If you want to map the JSON you need to define a corresponding Java Object, so for your example try it with the entity:
public class YourObject {
private String a;
// getter, setter and NoArgsConstructor
}
Then make use of Jackson's ObjectMapper to map the JSON string to a Java entity:
#GetMapping("temp")
public String temp(#RequestParam Map<String, String> blah) {
YourObject yourObject =
new ObjectMapper().readValue(blah.get("bar"),
YourObject.class);
return "Hello";
}
For further information/different approaches have a look at: JSON parameter in spring MVC controller
I have a spring boot application in which I am trying to use Feign to communicate with a remote service. My #FeignClient is defined as follows:
#FeignClient(name="TEST_SERVICE", url="URL")
#Component
public interface SomeServiceClient
{
#RequestMapping(
method = RequestMethod.POST,
value = "/someService",
consumes = "application/json",
produces = "application/json"
)
SomeServiceResult getServiceResult(
#RequestParam(value = "mode") String mode,
#RequestParam(value = "payload") SomeServicePayload payload
);
}
I would like the payload object of type SomeServicePayload to be serialized into JSON. I expected this to happen automatically, but it does not. Instead, payload is serialized to its fully qualified class name.
Do I need to set a custom encoder/decoder combination for this client? How would I do this?
#FeignClient under the hood used toString() method for bulding request string. The easiest way to create proper request is to override toString() method manually:
class SomeServicePayload{
String payload;
#Override
public String toString() {
return "{\"payload\":\"" + payload + "\"}";
}
}
Or for complex objects by using ObjectMapper:
public class SomeServicePayload{
private String payload;
public String getPayload() {
return payload;
}
public void setPayload(String payload) {
this.payload = payload;
}
private ObjectMapper mapper = new ObjectMapper();
#Override
public String toString() {
try {
return mapper.writeValueAsString(this);
} catch (JsonProcessingException e) {
//...
}
return null;
}
}
I am working with Spring Framework 4.3.1
I have the following domain class
#XmlRootElement(name="persona")
#XmlType(propOrder = {"id","nombre","apellido","fecha"})
public class Persona implements Serializable {
#XmlElement(name="id")
#JsonProperty("id")
public String getId() {
return id;
}
....
Where each getter has the #XmlElement and #JsonProperty annotations.
I am working with JAXB2 and Jackson2
I have the following too:
#XmlRootElement(name="collection")
public class GenericCollection<T> {
private Collection<T> collection;
public GenericCollection(){
}
public GenericCollection(Collection<T> collection){
this.collection = collection;
}
#XmlElement(name="item")
#JsonProperty("collection")
public Collection<T> getCollection() {
return collection;
}
public void setCollection(Collection<T> collection) {
this.collection = collection;
}
#Override
public String toString() {
StringBuilder builder = new StringBuilder();
for(Object object : collection){
builder.append("[");
builder.append(object.toString());
builder.append("]");
}
return builder.toString();
}
}
About Testing, the many #Tests methods working through Spring MVC Test work fine. The #Controller and #RestController work how is expected.
Note: I can test the CRUD scenarios, it about the HTTP methods such as POST, PUT, GET and DELETE. Therefore I am able to get one entity and a collection of entities.
Note: from the previous note, all works working around the XML and JSON formats.
Now trying to do testing through the RestTemplate how a kind of programmatic client, it only fails for collections. With the following:
#Before
public void setUp(){
mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
restTemplate = new RestTemplate(new MockMvcClientHttpRequestFactory(mockMvc));
List<HttpMessageConverter<?>> converters = new ArrayList<>();
converters.add(httpMessageConverterConfig.marshallingMessageConverter());
converters.add(httpMessageConverterConfig.mappingJackson2HttpMessageConverter());
restTemplate.setMessageConverters(converters);
System.out.println("converters.size():" + converters.size());
}
I can confirm converters.size() always prints 2
The following is for XML and JSON
#Test
public void findAllXmlTest(){
RequestEntity<Void> requestEntity = RestControllerSupport_.createRequestEntityForGet(uri, retrieveURI);
ParameterizedTypeReference<GenericCollection<Persona>> parameterizedTypeReference = new ParameterizedTypeReference<GenericCollection<Persona>>(){};
ResponseEntity<GenericCollection<Persona>> responseEntity = restTemplate.exchange(requestEntity, parameterizedTypeReference);
assertThat(responseEntity, notNullValue());
assertThat(responseEntity.getStatusCode(), is(HttpStatus.OK));
assertThat(responseEntity.getHeaders().getContentType(), is(MediaType.APPLICATION_XML) );
assertThat(responseEntity.getBody(), notNullValue());
assertThat(responseEntity.getBody().getClass(), is(GenericCollection.class));
assertThat(responseEntity.getBody().getCollection(), is(personas));
}
#Test
public void findAllJsonTest(){
RequestEntity<Void> requestEntity = RestControllerSupport_.createRequestEntityForGet(uri, retrieveURI);
ParameterizedTypeReference<GenericCollection<Persona>> parameterizedTypeReference = new ParameterizedTypeReference<GenericCollection<Persona>>(){};
ResponseEntity<GenericCollection<Persona>> responseEntity = restTemplate.exchange(requestEntity, parameterizedTypeReference);
assertThat(responseEntity, notNullValue());
assertThat(responseEntity.getStatusCode(), is(HttpStatus.OK));
assertThat(responseEntity.getHeaders().getContentType(), is(MediaType.APPLICATION_JSON_UTF8) );
assertThat(responseEntity.getBody(), notNullValue());
assertThat(responseEntity.getBody().getClass(), is(GenericCollection.class));
assertThat(responseEntity.getBody().getCollection(), is(personas));
}
Note: observe I am using ParameterizedTypeReference for both scenarios.
For JSON it works.
But for XML I get:
org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [com.manuel.jordan.controller.support.GenericCollection<com.manuel.jordan.domain.Persona>] and content type [application/xml]
at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:109)
What is wrong or missing?
Your problem that you use MarshallingHttpMessageConverter which isn't GenericHttpMessageConverter, like it is expected for the ParameterizedTypeReference in the HttpMessageConverterExtractor:
if (messageConverter instanceof GenericHttpMessageConverter) {
GenericHttpMessageConverter<?> genericMessageConverter =
(GenericHttpMessageConverter<?>) messageConverter;
if (genericMessageConverter.canRead(this.responseType, null, contentType)) {
The MappingJackson2HttpMessageConverter is that one.
So, I suggest you to try with Jaxb2CollectionHttpMessageConverter.