output: #fixed code
                                  public void dispatchEvent(ManagerEvent event)
      {
          // shouldn't happen
          if (event == null)
          {
              logger.error("Unable to dispatch null event");
              return;
          }
  
          logger.debug("Dispatching event:\n" + event.toString());
  
          // dispatch ResponseEvents to the appropriate responseEventHandler
          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 (RuntimeException e)
                          {
                              logger.warn("Unexpected exception in 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);
              }
          }
          if (event instanceof DisconnectEvent)
          {
              if (state == CONNECTED)
              {
                  state = RECONNECTING;
                  cleanup();
                  reconnectThread = new Thread(new Runnable()
                  {
                      public void run()
                      {
                          reconnect();
                      }
                  });
                  reconnectThread.setName("ReconnectThread-" + reconnectThreadNum.getAndIncrement());
                  reconnectThread.setDaemon(true);
                  reconnectThread.start();
              }
          }
          if (event instanceof ProtocolIdentifierReceivedEvent)
          {
              ProtocolIdentifierReceivedEvent protocolIdentifierReceivedEvent;
              String protocolIdentifier;
  
              protocolIdentifierReceivedEvent = (ProtocolIdentifierReceivedEvent) event;
              protocolIdentifier = protocolIdentifierReceivedEvent.getProtocolIdentifier();
              setProtocolIdentifier(protocolIdentifier);
          }
  
          // dispatch to listeners registered by users
          synchronized (eventListeners)
          {
              for (ManagerEventListener listener : eventListeners)
              {
                  try
                  {
                      listener.onManagerEvent(event);
                  }
                  catch (RuntimeException e)
                  {
                      logger.warn("Unexpected exception in eventHandler "
                              + listener.getClass().getName(), e);
                  }
              }
          }
      }
input: #vulnerable code 
                                  public void dispatchEvent(ManagerEvent event)
      {
          // shouldn't happen
          if (event == null)
          {
              logger.error("Unable to dispatch null event");
              return;
          }
  
          logger.debug("Dispatching event:\n" + event.toString());
  
          // dispatch ResponseEvents to the appropriate responseEventHandler
          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 (RuntimeException e)
                          {
                              logger.warn("Unexpected exception in 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);
              }
          }
          if (event instanceof DisconnectEvent)
          {
              if (state == CONNECTED)
              {
                  state = RECONNECTING;
                  cleanup();
                  reconnectThread = new Thread(new Runnable()
                  {
                      public void run()
                      {
                          reconnect();
                      }
                  });
                  reconnectThread.setName("ReconnectThread-" + reconnectThreadNum++);
                  reconnectThread.setDaemon(true);
                  reconnectThread.start();
              }
          }
          if (event instanceof ProtocolIdentifierReceivedEvent)
          {
              ProtocolIdentifierReceivedEvent protocolIdentifierReceivedEvent;
              String protocolIdentifier;
  
              protocolIdentifierReceivedEvent = (ProtocolIdentifierReceivedEvent) event;
              protocolIdentifier = protocolIdentifierReceivedEvent.getProtocolIdentifier();
              setProtocolIdentifier(protocolIdentifier);
          }
  
          // dispatch to listeners registered by users
          synchronized (eventListeners)
          {
              for (ManagerEventListener listener : eventListeners)
              {
                  try
                  {
                      listener.onManagerEvent(event);
                  }
                  catch (RuntimeException e)
                  {
                      logger.warn("Unexpected exception in eventHandler "
                              + listener.getClass().getName(), e);
                  }
              }
          }
      } 
                              #location 64 
                              #vulnerability type THREAD_SAFETY_VIOLATION