fix: наименование групп kafka

src/main/java/ru/dmitriymx/minecraft/globalchat/MainPlugin.java

@@ -21,8 +21,11 @@ public class MainPlugin extends JavaPlugin {
     }
 
     private void initKafkaService() {
+        ClassLoader originalContext = Thread.currentThread().getContextClassLoader();
+        Thread.currentThread().setContextClassLoader(null);
         //FIXME перенести в конфигурацию
         service = new KafkaService("127.0.0.1:9092", "global-chat", 1000);
+        Thread.currentThread().setContextClassLoader(originalContext);
 
         mqThread = new Thread(() -> {
             while (!Thread.currentThread().isInterrupted()) {

src/main/java/ru/dmitriymx/minecraft/globalchat/mq/KafkaService.java

@@ -62,19 +62,23 @@ public class KafkaService {
             }
         });
 
+        consumer.commitAsync();
+
         return list;
     }
 
     public void shutdown() {
+        producer.close();
         producer = null;
-        consumer.unsubscribe();
+
+        consumer.close();
         consumer = null;
     }
 
     private Consumer<Long, String> createConsumer() {
         final Properties props = new Properties();
         props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, hosts);
-        props.put(ConsumerConfig.GROUP_ID_CONFIG, "DefaultGroup");
+        props.put(ConsumerConfig.GROUP_ID_CONFIG, "WithoutGroup." + UUID.randomUUID().toString());
         props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, LongDeserializer.class.getName());
         props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());