oops! забыли про асинхронный поток

src/main/java/ru/dmitriymx/vkapi/VkApi.java

@@ -30,6 +30,7 @@ public class VkApi implements Runnable {
 
     private Timer timer = new Timer();
     private int countCallApiPerSecond = 0;
+    private Thread asyncExecApiThread = null;
 
     private BlockingQueue<TaskMethod> queueExecute = new SynchronousQueue<>();
 
@@ -66,6 +67,11 @@ public class VkApi implements Runnable {
     }
 
     public void execApiAsync(String apiMethod, Map<String, String> params, Callback callback) {
+        if (asyncExecApiThread == null) {
+            asyncExecApiThread = new Thread(this);
+            asyncExecApiThread.start();
+        }
+
         queueExecute.offer(TaskMethod.builder()
                                    .method(apiMethod)
                                    .postData(params)
@@ -123,6 +129,12 @@ public class VkApi implements Runnable {
         return gson.fromJson(response.getContent(), JsonObject.class);
     }
 
+    public void shutdownAsyncThread() {
+        if (asyncExecApiThread != null && !asyncExecApiThread.isInterrupted()) {
+            asyncExecApiThread.interrupt();
+        }
+    }
+
     private String paramsToString(Map<String, String> params) {
         final StringJoiner sj = new StringJoiner("&");
         sj.add("access_token=" + accessToken).add("v=" + apiVersion);