Jersey: Print the actual request

Question

How can I view the actual request that Jersey generates and sends to the server? I am having issues with a particular request and the fellow running the webserver asked to

Answer 1

If you're just using Jersey Client API, LoggingFilter (client filter) should help you:

Client client = Client.create();
client.addFilter(new LoggingFilter(System.out));
WebResource webResource = client.resource("http://localhost:9998/");
ClientResponse response = webResource.accept(MediaType.APPLICATION_JSON)
                                         .get(ClientResponse.class);

Otherwise, you can again log both request and response on server using other LoggingFilter (container filter).

Answer 2

Since Jersey 2.23, there's a LoggingFeature you could use. The following is a bit simplified example, please note that you can register the feature on WebTarget as well.

Logger logger = Logger.getLogger(getClass().getName());

Feature feature = new LoggingFeature(logger, Level.INFO, null, null);

Client client = ClientBuilder.newBuilder()
        .register(feature)
        .build();

Response response = client.target("https://www.google.com")
        .queryParam("q", "Hello, World!")
        .request().get();

JavaDoc of LoggingFeature says that the request "and/or" the response is logged lol. On my machine, both are logged.

Answer 3

All these answers are pretty close but they lack the setting to log the request and response body. At least with Jersey 2.30.1 this is how I accomplish logging the request and response including their respective bodies:

import javax.ws.rs.client.ClientBuilder;
import org.glassfish.jersey.logging.LoggingFeature;
import java.util.logging.Level;
import java.util.logging.Logger;

Logger logger = Logger.getLogger("LoggingFeature");
logger.setLevel(Level.ALL);
ClientBuilder.newClient()
  .target("https://www.example.com")
  .register(new LoggingFeature(
    logger,
    Level.ALL,
    LoggingFeature.Verbosity.PAYLOAD_ANY,
    8192))
  .request()
  .get();

Technically the Level.All and 8192 values could be null. I just provide them here to be concise.

Answer 4

@ivan.cikic's answer is for Jersey 1.x. Here's how you do it in Jersey 2.x:

import org.glassfish.jersey.client.ClientConfig;
import org.glassfish.jersey.filter.LoggingFilter;
import org.json.JSONException;
import org.json.JSONObject;

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.Form;
import javax.ws.rs.core.MediaType;

...

        ClientConfig config = new ClientConfig();

        Client client = ClientBuilder.newClient(config);
        client.register(new LoggingFilter());

This is irrelevant but I just have to complain: The new LoggingFilter is really annoying because it forces you to use Java Util Logging. It would be better if it gave me control over the logger. Seems like a step backwards in design.