Java串行通信。获取的错误为'；这不是我写的任何代码

我正在写一个监控串行设备输出的小程序。我正在使用jSerialComm库，但出现了一个错误（不会使程序崩溃，它会继续运行）。错误如下（我不确定它是否与串行相关，因为我看到swing提到了很多，但是错误每隔5秒左右就会触发一次（每次我从设备接收到一个新的数据字符串）：

现在，所有这些链接的代码行都不在我编写的代码中，所以我不知道如何调试它们

这是我的密码：

private void btn_refreshActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // Re Query the COM ports to see available ports.
        updateStatus("Port List Updated");
        comPortList = SerialPort.getCommPorts();
        dropDownPorts.removeAllItems();
        for (SerialPort value: comPortList) {
            dropDownPorts.addItem(value.getSystemPortName());
        }
    
public void connectPort(int index) {
            System.out.println("Attempting to connect to Index:" + index);
            int baudRate = 115200;
                    
            SerialPort comPort = comPortList[index];
            currentConnectedPort = comPort;
            comPort.openPort();
            comPort.setParity(SerialPort.NO_PARITY);
            comPort.setNumStopBits(SerialPort.ONE_STOP_BIT);
            comPort.setNumDataBits(8);
            comPort.addDataListener(this);
            comPort.setBaudRate(baudRate);
                    
            System.out.println("Connection successful!");
            updateStatus("Connected!");
        }
        
         @Override
        public int getListeningEvents() {
            return SerialPort.LISTENING_EVENT_DATA_AVAILABLE;
        }
    
        @Override
        public void serialEvent(com.fazecast.jSerialComm.SerialPortEvent event) {
            System.out.println("Serial Event triggered!");
            if (event.getEventType() != SerialPort.LISTENING_EVENT_DATA_AVAILABLE) {
                System.out.println("Event type is not LISTENING EVENT");
                return;
            }
    
            int bytesAvailable = currentConnectedPort.bytesAvailable();
            if (bytesAvailable <= 0) {
                System.out.println("Bytes available <= 0");
                return;
            }
    
            int bytesRead = currentConnectedPort.readBytes(buffer, Math.min(buffer.length, bytesAvailable));
            String response = new String(buffer, 0, bytesRead);
            System.out.println("Response received is");
            System.out.println(response);
            parseData(response);
        }

private void btn_refreshActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // Re Query the COM ports to see available ports.
        updateStatus("Port List Updated");
        comPortList = SerialPort.getCommPorts();
        dropDownPorts.removeAllItems();
        for (SerialPort value: comPortList) {
            dropDownPorts.addItem(value.getSystemPortName());
        }
    
public void connectPort(int index) {
            System.out.println("Attempting to connect to Index:" + index);
            int baudRate = 115200;
                    
            SerialPort comPort = comPortList[index];
            currentConnectedPort = comPort;
            comPort.openPort();
            comPort.setParity(SerialPort.NO_PARITY);
            comPort.setNumStopBits(SerialPort.ONE_STOP_BIT);
            comPort.setNumDataBits(8);
            comPort.addDataListener(this);
            comPort.setBaudRate(baudRate);
                    
            System.out.println("Connection successful!");
            updateStatus("Connected!");
        }
        
         @Override
        public int getListeningEvents() {
            return SerialPort.LISTENING_EVENT_DATA_AVAILABLE;
        }
    
        @Override
        public void serialEvent(com.fazecast.jSerialComm.SerialPortEvent event) {
            System.out.println("Serial Event triggered!");
            if (event.getEventType() != SerialPort.LISTENING_EVENT_DATA_AVAILABLE) {
                System.out.println("Event type is not LISTENING EVENT");
                return;
            }
    
            int bytesAvailable = currentConnectedPort.bytesAvailable();
            if (bytesAvailable <= 0) {
                System.out.println("Bytes available <= 0");
                return;
            }
    
            int bytesRead = currentConnectedPort.readBytes(buffer, Math.min(buffer.length, bytesAvailable));
            String response = new String(buffer, 0, bytesRead);
            System.out.println("Response received is");
            System.out.println(response);
            parseData(response);
        }

 public void updateGUI() {
        // triggered by parser
        streamRx += newLine;
        txt_rawOutput.setText(streamRx);
        
        if (values.length > 52) {
            System.out.println("received values string");
            txt_coilIn.setText(values[8]);
            txt_coilOut.setText(values[9]);
            txt_coilCtrl.setText(values[6]);
            txt_compressorCtrl.setText(values[11]);
            txt_compressorActual.setText(values[12]);
            txt_fan1Pwr.setText(values[2]);
            txt_fan2Pwr.setText(values[4]);
            txt_freezerTemp.setText(values[22]);
            txt_fridgeTemp.setText(values[31]);
            txt_targetTemp.setText(values[20]);
            txt_timeStamp.setText(values[0]);
            txt_ambientTemp.setText(values[72]);
            txt_heater1Pwr.setText(values[46]);
            txt_heater2Pwr.setText(values[50]);
            txt_freezerPan.setText(values[48]);
            txt_fridgePan.setText(values[52]);
            txt_coilIn.updateUI(); 
            txt_coilOut.updateUI();
            txt_coilCtrl.updateUI();
            txt_compressorCtrl.updateUI();
            txt_compressorActual.updateUI();
            txt_fan1Pwr.updateUI();
            txt_fan2Pwr.updateUI();
            txt_freezerTemp.updateUI();
            txt_fridgeTemp.updateUI();
            txt_targetTemp.updateUI();
            txt_timeStamp.updateUI();
            txt_ambientTemp.updateUI();
            txt_heater1Pwr.updateUI();
            txt_heater2Pwr.updateUI();
            txt_freezerPan.updateUI();
            txt_fridgePan.updateUI();
        }
                
        //UPDATE UI
        txt_rawOutput.updateUI(); 
        txt_rawOutput.setCaretPosition(txt_rawOutput.getDocument().getLength() - 1);
    }