output: #fixed code
                                  public void dispatchEvent(ManagerEvent event)
      {
          // shouldn't happen
          if (event == null)
          {
              logger.error("Unable to dispatch null event. This should never happen. Please file a bug.");
              return;
          }
  
          logger.debug("Dispatching event:\n" + event.toString());
  
          // Some events need special treatment besides forwarding them to the
          // registered eventListeners (clients)
          // These events are handled here at first:
  
          // Dispatch ResponseEvents to the appropriate responseEventListener
          if (event instanceof ResponseEvent)
          {
              ResponseEvent responseEvent;
              String internalActionId;
  
              responseEvent = (ResponseEvent) event;
              internalActionId = responseEvent.getInternalActionId();
              if (internalActionId != null)
              {
                  synchronized (responseEventListeners)
                  {
                      ManagerEventListener listener;
  
                      listener = responseEventListeners.get(internalActionId);
                      if (listener != null)
                      {
                          try
                          {
                              listener.onManagerEvent(event);
                          }
                          catch (Exception e)
                          {
                              logger.warn("Unexpected exception in response event listener " + listener.getClass().getName(),
                                      e);
                          }
                      }
                  }
              }
              else
              {
                  // ResponseEvent without internalActionId:
                  // this happens if the same event class is used as response
                  // event
                  // and as an event that is not triggered by a Manager command
                  // Example: QueueMemberStatusEvent.
                  // logger.debug("ResponseEvent without "
                  // + "internalActionId:\n" + responseEvent);
              } // NOPMD
          }
          if (event instanceof DisconnectEvent)
          {
              // When we receive get disconnected while we are connected start
              // a new reconnect thread and set the state to RECONNECTING.
              if (state == CONNECTED)
              {
                  state = RECONNECTING;
                  // close socket if still open and remove reference to
                  // readerThread
                  // After sending the DisconnectThread that thread will die
                  // anyway.
                  cleanup();
                  Thread reconnectThread = new Thread(new Runnable()
                  {
                      public void run()
                      {
                          reconnect();
                      }
                  });
                  reconnectThread.setName("Asterisk-Java ManagerConnection-" + id + "-Reconnect-"
                          + reconnectThreadCounter.getAndIncrement());
                  reconnectThread.setDaemon(true);
                  reconnectThread.start();
                  // now the DisconnectEvent is dispatched to registered
                  // eventListeners
                  // (clients) and after that the ManagerReaderThread is gone.
                  // So effectively we replaced the reader thread by a
                  // ReconnectThread.
              }
              else
              {
                  // when we receive a DisconnectEvent while not connected we
                  // ignore it and do not send it to clients
                  return;
              }
          }
          if (event instanceof ProtocolIdentifierReceivedEvent)
          {
              ProtocolIdentifierReceivedEvent protocolIdentifierReceivedEvent;
              String protocolIdentifier;
  
              protocolIdentifierReceivedEvent = (ProtocolIdentifierReceivedEvent) event;
              protocolIdentifier = protocolIdentifierReceivedEvent.getProtocolIdentifier();
              setProtocolIdentifier(protocolIdentifier);
              // no need to send this event to clients
              return;
          }
  
          fireEvent(event);
      }
input: #vulnerable code 
                                  public void dispatchEvent(ManagerEvent event)
      {
          // shouldn't happen
          if (event == null)
          {
              logger.error("Unable to dispatch null event. This should never happen. Please file a bug.");
              return;
          }
  
          logger.debug("Dispatching event:\n" + event.toString());
  
          // Some events need special treatment besides forwarding them to the
          // registered eventListeners (clients)
          // These events are handled here at first:
  
          // Dispatch ResponseEvents to the appropriate responseEventListener
          if (event instanceof ResponseEvent)
          {
              ResponseEvent responseEvent;
              String internalActionId;
  
              responseEvent = (ResponseEvent) event;
              internalActionId = responseEvent.getInternalActionId();
              if (internalActionId != null)
              {
                  synchronized (responseEventListeners)
                  {
                      ManagerEventListener listener;
  
                      listener = responseEventListeners.get(internalActionId);
                      if (listener != null)
                      {
                          try
                          {
                              listener.onManagerEvent(event);
                          }
                          catch (Exception e)
                          {
                              logger.warn("Unexpected exception in response event listener " + listener.getClass().getName(),
                                      e);
                          }
                      }
                  }
              }
              else
              {
                  // ResponseEvent without internalActionId:
                  // this happens if the same event class is used as response
                  // event
                  // and as an event that is not triggered by a Manager command
                  // Example: QueueMemberStatusEvent.
                  // logger.debug("ResponseEvent without "
                  // + "internalActionId:\n" + responseEvent);
              } // NOPMD
          }
          if (event instanceof DisconnectEvent)
          {
              // When we receive get disconnected while we are connected start
              // a new reconnect thread and set the state to RECONNECTING.
              if (state == CONNECTED)
              {
                  state = RECONNECTING;
                  // close socket if still open and remove reference to
                  // readerThread
                  // After sending the DisconnectThread that thread will die
                  // anyway.
                  cleanup();
                  reconnectThread = new Thread(new Runnable()
                  {
                      public void run()
                      {
                          reconnect();
                      }
                  });
                  reconnectThread.setName("Asterisk-Java ManagerConnection-" + id + "-Reconnect-"
                          + reconnectThreadCounter.getAndIncrement());
                  reconnectThread.setDaemon(true);
                  reconnectThread.start();
                  // now the DisconnectEvent is dispatched to registered
                  // eventListeners
                  // (clients) and after that the ManagerReaderThread is gone.
                  // So effectively we replaced the reader thread by a
                  // ReconnectThread.
              }
              else
              {
                  // when we receive a DisconnectEvent while not connected we
                  // ignore it and do not send it to clients
                  return;
              }
          }
          if (event instanceof ProtocolIdentifierReceivedEvent)
          {
              ProtocolIdentifierReceivedEvent protocolIdentifierReceivedEvent;
              String protocolIdentifier;
  
              protocolIdentifierReceivedEvent = (ProtocolIdentifierReceivedEvent) event;
              protocolIdentifier = protocolIdentifierReceivedEvent.getProtocolIdentifier();
              setProtocolIdentifier(protocolIdentifier);
              // no need to send this event to clients
              return;
          }
  
          fireEvent(event);
      } 
                              #location 68 
                              #vulnerability type THREAD_SAFETY_VIOLATION