Upgrading from Jersey Client 1.x to Jersey Client 2.x

Question

I am using jersey-client-1.9. sample code:

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;

Client client = Client.create();
webResource = client.resource("http://localhost:8047/storage/hive.json");
String input = //rest request
ClientResponse response = webResource.type("application/json").post(ClientResponse.class, input);
String queryRespose = response.getEntity(String.class);

As this project has changed from com.sun.jersey.api.client to org.glassfish.jersey.client. How to achieve this in jersey-client-2.8 ?

Edit:

import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.Response;

Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://localhost:8047/query.json");
String input =//rest request
Response response = target.request().post(Entity.json(input));
String queryRespose = response.readEntity(String.class);

This worked...:)

Answer 1

With Jersey 2.x, you can build the Client with ClientBuilder

Client client = ClientBuilder.newClient();

In Jersey 2.x WebTarget is analogous to Jersey 1.x WebResource, and instead of calling client.resource() to get the WebResource, you call client.target() to get the WebTarget

WebTarget target = client.target(url); 

Then you need to call request() on the WebTarget to get an Invocation.Builder, which will allow you to chain other calls

Invocation.Builder invocation = target.request();

To send an entity, we need to pass an Entity to one of the Invocation.Builder's request method. For instance

Response response = builder.post(Entity.json(input);

To read the response, use response.readEntity(String.class). So altogether, you can do

Client client = ClientBuilder.newClient();
WebTarget target = client.target(url);
Response response = target.request().post(Entity.json(input));
String entity = response.readEntity(String.class);

See Also:

• how to send json object from REST client using javax.ws.rs.client.WebTarget
• Client API documentation

---

UPDATE

You may also need the following dependency for JSON/POJO support

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>${jersey.version}</version>
</dependency>

Then register the JacksonFeature with the client. This is so input (if you want to use a POJO instead of String) can be serialized to JSON

client.register(JacksonFeature.class);