Question

The error I receive:

SEVERE: A message body reader for Java class java.util.List, 
and Java type java.util.List<com.testapp.Category>, 
and MIME media type text/html; charset=utf-8 was not found

Trying to consume a JSON response from a Rest service using the GET method with Jersey. The response from the server looks like this when I use curl:

[{"category":{"id":"4d9c5dfc8ddfd90828000002","description":"Cows"}},
{"category":{"id":"4d9c5dfc8ddfd90828000023","description":"Dogs"}},
...
{"category":{"id":"4d9c5dfc8ddfd90828000024","description":"Mules"}}]

Consuming the service with:

public List<Category> getAnimalCategories(Cookie cookie) {
    Client client = Client.create(new DefaultClientConfig());
    ClientResponse response = client
        .resource(Constants.BASE_URL)
        .path(Constants.CATEGORIES_ANIMALS)
        .accept(MediaType.APPLICATION_JSON)
        .type(MediaType.APPLICATION_JSON)
        .cookie(cookie)
        .get(ClientResponse.class);

    return response.getEntity(new GenericType<List<Category>>(){});
}

Where Category.java is:

public class Category {

public String id;
public String description;

public Category() {
}

public Category(String id, String description) {
    super();
    this.id = id;
    this.description = description;
}

The service uses cookie based authentication – that part works and I have other service calls working with the cookie.

Answer 1

Used the Jackson 1.9.6 lib to resolve the issue – see the 2nd line below:

ClientConfig clientConfig = new DefaultClientConfig();
clientConfig.getClasses().add(JacksonJsonProvider.class);
Client client = Client.create(clientConfig);

return client
    .resource(Constants.BASE_URL)
    .path(Constants.CATEGORIES_ANIMALS)
    .type(MediaType.APPLICATION_JSON)
    .accept(MediaType.APPLICATION_JSON)
    .cookie(cookie)
    .get(new GenericType<List<AnimalCategoryResponse>>(){});

Also needed to use a new response class:

public class AnimalCategoryResponse {
    public Category[] category;
    public AnimalCategoryReponse() { }
}