ResponseEntity returns null list of objects

ResponseEntity returns null list of objects

responseentity return list of objects
responseentity<list of objects resttemplate
convert responseentity to json object
spring rest return list of objects
responseentity<object>
map responseentity to java object
responseentity.getbody() to json
parameterizedtypereference

I am able to consume an API who returns a json object. What I am trying to do is to get a list of objects instead. Below is my code for the same:

ResponseEntity<List<Entity>> responseEntity = restTemplate.exchange(dataUrl, HttpMethod.GET, entity,new ParameterizedTypeReference<List<Entity>>() {});

where Entity of an object of which I am expecting a list to be populated with data from json. But when I print it, all fields from Entity has null value set. What am I missing?

Thanks Sach


Can you try with this

ResponseEntity<List<Entity>> responseEntity = restTemplate.exchange(dataUrl, HttpMethod.GET, entity, Entity.class);

p.s. sorry don't have reputation for comment :(

org.springframework.http.ResponseEntity java code examples , BAD_REQUEST); return new ResponseEntity >(results, HttpStatus.OK); Object body;ResponseEntity.ok(body); Smart code suggestions by Codota clientCommand == null) { return new ResponseEntity<List<JSONObject>>( HttpStatus. If you would prefer a List of Objects, one way to do it is like this: public <T> List <T> getApi ( final String path, final HttpMethod method) { final RestTemplate restTemplate = new RestTemplate (); final ResponseEntity< List <T>> response = restTemplate.exchange ( path, method, null , new ParameterizedTypeReference< List <T>> () {}); List <T> list = response.getBody (); return list ; }


Why don't use restTemplate.getForEntity?

ResponseEntity<Entity[]> response = restTemplate.getForEntity(dataUrl, Entity[].class)
Entity[] entities = response.getBody();

The above case returns an object of type Entity[], which is an array.

If you want to use the List interface, you will need to create a wrapper class.

The wrapper:

public class EntityList {
    private List<Entity> entities;

    public EntityList() {
        entities= new ArrayList<>();
    }

    // standard constructor and getter/setter
}

The RestTemplate call:

Here you will use restTemplate.getForObject

EntityList response = restTemplate.getForObject(dataUrl, EntityList.class);
List<Entity> entities = response.getEntities();

Even a simpler alternative is to use List.class as the return type of getForObject.

List<Entity> response= rest.getForObject(dataUrl, List.class);

RestTemplate returns null response - spring - html, RestTemplate returns null response - spring. Is it better to pass back String or Object in the ResponseEntity<>? I have a controller that returns I am trying to use Spring Boot to return a list of codes from a DB table. When I call my REST� org.springframework.http.ResponseEntity<T> also extends HttpEntity, where we can add additional HttpStatus (see also @ResponseStatus) to the response. In this example we are going to show the use of RequestEntity and RequestResponse with JUnit tests.


It is hard to give a correct answer due to a missing json example. Could you please provide a sample of the json that will be returned.

Get and Post Lists of Objects with RestTemplate, However, working with collections of objects is not so straightforward. Whatever class we specify there will match ResponseEntity's� The following examples show how to use org.springframework.http.ResponseEntity.These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example.


RESOLVED

Below is the code change I did which was returning correct list of Entity objects.

ResponseEntity<Entity[]> responseEntity = restTemplate.exchange(dataUrl, HttpMethod.GET, entity, Entity[].class);

Even after making this change didnt really solved my issue. I also had to add

@JsonProperty("fieldName") on each field in Entity class which had to match Json properties. 

Java Code Examples for org.springframework.http.ResponseEntity, getFieldErrors(); List<Object[]> messages = new ArrayList<>(); for (FieldError fieldError updateLoggers(); } return new ResponseEntity<>(listLoggers(ctx), HttpStatus.OK); } safeParse(paymentMethodStr); if (paymentMethod == null) { return� ResponseEntity represents the whole HTTP response: status code, headers, and body. Because of it, we can use it to fully configure the HTTP response. If we want to use it, we have to return it from the endpoint; Spring takes care of the rest. ResponseEntity is a generic type. As a result, we can use any type as the response body:


ResponseEntity (Spring Framework 5.2.7.RELEASE API), Can also be used in Spring MVC, as the return value from a @Controller method: getForEntity(String, Class, Object. A shortcut for creating a ResponseEntity with the given body and the OK status, or an empty body and a NOT FOUND� ResponseEntity. ResponseEntity represents an HTTP response, including headers, body, and status. While @ResponseBody puts the return value into the body of the response, ResponseEntity also allows us to add headers and status code. Spring Boot ResponseEntity example. In the following application, we demonstrate the usage of ResponseEntity.


Use spring Response Entity to process HTTP return requests, Use spring Response Entity to process HTTP return requests @param status the status code */ public ResponseEntity(HttpStatus status) { this(null, null, status ); } We rewrite the above code to return the list of objects using� Usually, in the context of front-end and back-end separation, our back-end services are usually returned to the front-end formatted data, such as Json. At the beginning, we used JSON package to produce a JSON string, which is customized with some API s of http protocol. spring has evolved to tUTF-8


Receiving a JSON string response from a URL, The of hostnames reference could be a simple List<String> instead of. LinkedList <String> See: Effective Java, 2nd edition, Item 52: Refer to objects by their interfaces. This: isEmpty()) { return new DataResponse(null, DataErrorEnum. ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod. GET� First define an object to hold the entity coming back in the array.. e.g. @JsonIgnoreProperties(ignoreUnknown = true) public class Rate { private String name; private String code; private Double rate; // add getters and setters }