// 6.1.0
        RemoteRestRuntimeEngineFactory restSessionFactory = RemoteRuntimeEngineFactory.newRestBuilder().addDeploymentId(deploymentId).addUrl(url)
                .addUserName(USER).addPassword(PASSWORD)

                .buildFactory();
        RemoteRuntimeEngine engine = restSessionFactory.newRuntimeEngine();


        KieSession kSession = engine.getKieSession();
        TaskService taskService = engine.getTaskService();

        List<Long> taskList = taskService.getTasksByProcessInstanceId(13);
        System.out.println("list size shuold be 1:"+taskList.size());


        // create task results - type Map
        Map<String,String> sampleMap = new HashMap<String,String>();
        sampleMap.put("SampleKey", "SampleValue");
        // create task results - type Set
        Set<String> sampleSet = new HashSet<String>();
        sampleSet.add("entry");


        Map<String,Object> taskResults = new HashMap<String,Object>();
        taskResults.put("sampleOutput", sampleMap);
        taskResults.put("sampleOutput2", sampleSet);

        //send them remotely
        taskService.start(taskList.get(0), "anton");
        taskService.complete(taskList.get(0), "anton", taskResults);

        taskList = taskService.getTasksByProcessInstanceId(13);
        System.out.println("list size shuold be 0 / null:"+taskList);

--->> TRACE level shows that this request has been sent:
[main] TRACE org.kie.services.client.api.command.AbstractRemoteCommandObject - Sending CompleteTaskCommand via POST to http://localhost:8080/business-central/rest/execute
[main] TRACE org.kie.services.client.api.command.AbstractRemoteCommandObject - Serialized JaxbCommandsRequest:<?xml version="1.0" encoding="UTF-8"?>
<command-request>
   <deployment-id>org.redhat.gss:HashMapProject:1.0</deployment-id>
   <ver>6.2.0.1</ver>
   <user>anton</user>
   <complete-task>
      <user-id>anton</user-id>
      <task-id>11</task-id>
      <data>
         <item key="sampleOutput2">
            <value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="hashSet" />
         </item>
         <item key="sampleOutput">
            <value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="hashMap" />
         </item>
      </data>
   </complete-task>
</command-request>