How to call JBPM6's RESTFul API with athentication details

In JBPM 6 the inbuilt RESTFul API is a great feature which makes our lives easier.
In order to use these APIs, you have to provide authentication details with the request in request header.
First join the username and the password with a colon and encode it using Base64 encoder. Then append the word "Basic " (note the space) and put as "Autorization" header.
Ex:-
  "Basic " + Base64Encode(<username> + ":" + <password>)

See below working complete code written in java to get the task list of krisv.

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class JBPMRest {
  public static void getTaskSummaryList() throws Exception {
    String status = "Reserved";
    String actor = "krisv";

    String addr = "http://localhost:8080/jbpm-console/rest/task/query?status=" + status + "&potentialOwner=" + actor;
    try {
      HttpClient client = HttpClientBuilder.create().build();
      HttpGet get = new HttpGet(addr);

      String authData = "krisv" + ":" + "krisv";
      String encoded = new sun.misc.BASE64Encoder().encode(authData.getBytes());
      get.setHeader("Authorization", "Basic " + encoded);
      get.setHeader("Content-Type", "application/json");
      get.setHeader("ACCEPT", "application/xml");

      HttpResponse cgResponse = client.execute(get);
      String content = EntityUtils.toString(cgResponse.getEntity());
      System.out.println(content);
    } catch (Exception e) {
      throw new Exception("Error consuming service.", e);
    }
  }
}