How to get list as response from jersey2 client

Question

I want to know how I can extract a List<String> as response from the jersey-2.0 client.

I have already tried this,

List<String> list = client
                      .target(url)
                      .request(MediaType.APPLICATION_JSON)
                      .get(new GenericType<List<String>>(){});

But, the above code is not working. It is not returning the expected List<String> but, a null value instead.

user2004685 · Answer 1 · 2019-07-30T22:20:37.730

61

You can get your service response as Response class object and, then parse this object using readEntity(...) method.

Here is a quick code snippet:

List<String> list = client
                      .target(url)
                      .request(MediaType.APPLICATION_JSON)
                      .get(Response.class)
                      .readEntity(new GenericType<List<String>>() {});
/* Do something with the list object */

edited Jul 30 '19 at 22:20

answered Feb 10 '16 at 11:23

user2004685

8,721
4
29
49

I am getting size=5 but all elements are null is displayed on debug.But elements are present – Saurabh Feb 10 '16 at 11:46
Can you please share the JSON Response from the Service you are trying to consume? – user2004685 Feb 10 '16 at 11:48
This is the json response ["mumbai","delhi","calcutta"] – Saurabh Feb 10 '16 at 11:51
1

This is not `List` but `JSONArray`. There is a difference. – user2004685 Feb 10 '16 at 12:21
1

ya thanks,I converted jsonString to list.String listString= serviceResponse.readEntity(String.class) and converted back to jsonArray and then to list – Saurabh Feb 10 '16 at 12:27

Saurabh · Answer 2 · 2016-09-08T18:27:09.597

1

String listString= serviceResponse.readEntity(String.class);
Gson gson=new Gson();
Type type = new TypeToken<List<String>>(){}.getType();
List<String> list = gson.fromJson(listString, type);

Get response string and then convert to List by using gson library

edited Sep 08 '16 at 18:27

answered Sep 07 '16 at 17:38

Saurabh

6,001
3
38
40

1

This answer turned up in the low quality review queue, presumably because you don't provide any explanation of the code. If this code answers the question, consider adding adding some text explaining the code in your answer. This way, you are far more likely to get more upvotes — and help the questioner learn something new. – lmo Sep 07 '16 at 22:12

score 0 · Answer 3 · answered Mar 24 '20 at 10:33

First add jackson dependency

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.27</version>
</dependency>

Then create Client Config

ClientConfig config = new ClientConfig();
config.register( JacksonFeature.class );

Finally create the client through the ClientConfig

List<String> list = ClientBuilder.newClient( config )
               .target( uri )
               .request()
               .get( Response.class )
               .readEntity( List.class );

This will work, but will show an unchecked cast warning converting from List to List. The answers using GenericType are more accurate. — John Calcote, May 20 '21 at 23:26

score -2 · Answer 4 · answered Feb 10 '16 at 11:34

-2

1) Take your Response in the then parse the Response Object using readEntity() method.

List<String> list = client.target(url).
request(MediaType.APPLICATION_JSON).get(Response.class).readEntity(new GenericType<List<String>>() {
});

answered Feb 10 '16 at 11:34

Arslan Ahmad

11
1

How to get list as response from jersey2 client

4 Answers4

Linked