Jersey ClientResponse.getEntity of generic type

Question

I got a problem to deserialize using jeresy ClientRespone.getEntity

I\'ve tried to follow some tutorials and questions, include this: http://jersey.576304.n2.nabble

Answer 1

Few things either need to be fixed or added (not sure in your case as some parts are missing)

Resource: Made my own to test, as yours was missing a few items

@Path("/")
public class AccountResource {
    @GET
    @Path("/account") // route to a specific method.re
    @Produces(MediaType.APPLICATION_JSON)
    public Response saveDataIntoHash() {
        List<Account> accounts = new ArrayList<Account>();
        accounts.add(new Account("Stack", "Savings"));
        accounts.add(new Account("Overflow", "Checkings"));
        GenericEntity generic = new GenericEntity<List<Account>>(accounts){};
        return Response.status(201).entity(generic).build();
    }
}

Assumed you have this dependency:

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-json</artifactId>
    <version>${jersey-version}</version>
</dependency>

Test case: Notice the client configuration. This is needed.

public void testMyResource() {
    ClientConfig config = new DefaultClientConfig();
    config.getClasses().add(JacksonJaxbJsonProvider.class);
    config.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);

    Client c = Client.create(config);

    WebResource resource = c.resource(Main.BASE_URI);
    ClientResponse response = resource.path("account")
            .accept("application/json").get(ClientResponse.class);

    List<Account> accounts
                = response.getEntity(new GenericType<List<Account>>(){});

    StringBuilder builder = new StringBuilder("=== Accounts ===\n");
    for (Account account: accounts) {
        builder.append("Name: ").append(account.getName()).append(", ")
                .append("Type: ").append(account.getType()).append("\n");          
    }
    builder.append("==================");
    System.out.println(builder.toString());    
}

Account (client) class is missing one annotation. It is required as you are using field annotations. Another option is to add a getter and setter for the id

@XmlRootElement  
@XmlAccessorType(XmlAccessType.FIELD)  // <======= This Here
public class Account {
    // added toString for testing
    @Override
    public String toString() {
        return "Account{" + "name=" + name 
                          + ", type=" + type 
                          + ", id=" + id + '}';
    }
}

Result from test:

=== Accounts ===
Name: Stack, Type: Savings
Name: Overflow, Type: Checkings
==================

Note: this test is based on the assumption that nothing is wrong on your server side.