justinmclean opened a new issue, #8206:
URL: https://github.com/apache/gravitino/issues/8206

   ### What would you like to be improved?
   
   In core/src/main/java/org/apache/gravitino/listener/AsyncQueueListener.java, 
a NPE can occur.
   
   Here's a unit test to show the issue:
   ```
   public class TestAsyncQueueListener {
     private static class NoopListener implements EventListenerPlugin {
       @Override
       public void init(Map<String, String> properties) {}
   
       @Override
       public void start() {}
   
       @Override
       public void stop() {}
     }
   
     @Test
     public void testDropEventLoggingDoesNotThrow() {
       AsyncQueueListener listener =
           new AsyncQueueListener(Collections.singletonList(new 
NoopListener()), "test", 1, 1);
       PreEvent event = new ListMetalakePreEvent("user");
       listener.onPreEvent(event); // fill the queue
       Assertions.assertDoesNotThrow(() -> listener.onPreEvent(event));
     }
   }
   ```
   
   ### How should we improve?
   
   Fix by initialising lastRecordDropEventTime


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