Getting wrong values from serial port in Java

Question

I am trying to read values from ALGE-TIMING device connected to the serial port via Arduino.

The Arduino reads the input signal it gets from the ALGE and transmits it to the serial port continuously. The values are in the range from 10-30 when the beam is not cut. When the beam is cut, it sends 0.
I can see this value in Arduino's Serial Monitor but when I try to read this value through Java, I get random 0's even without any beam-cut.

Here is what I'm doing:

    static final String PORT_NAME = "COM10"; 
    private static final int TIME_OUT = 2000;
    private static final int DATA_RATE = 9600;  


    public void initialize() {
            CommPortIdentifier portId = null;
            Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

            //First, Find an instance of serial port as set in PORT_NAME.
            while (portEnum.hasMoreElements()) {
                CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
                if (currPortId.getName().equals(PORT_NAME)) {
                    portId = currPortId;
                }
            }
            if (portId == null) {
                System.out.println("Could not find COM port.");
                return;
            }

            try {
                serialPort = (SerialPort) portId.open(this.getClass().getName(), TIME_OUT);
                serialPort.setSerialPortParams(DATA_RATE, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
                is = serialPort.getInputStream();

                //console = System.console();
                serialPort.addEventListener(this);
                serialPort.notifyOnDataAvailable(true);
                //serialPort.enableReceiveTimeout(500);
            } catch (Exception e) {
                System.err.println(e.toString());
            }
        }
@Override
    public synchronized void serialEvent(SerialPortEvent oEvent) {
        if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
            int val = 111;
            try {
                Scanner sc = new Scanner(serialPort.getInputStream());
                if (sc.hasNext()) {
                    val = Integer.parseInt(sc.next()); //sc.nextInt() didn't solved the problem either
                    cRead(val);
                }
            } catch (Exception e) {
                System.err.println(e.toString());
                System.out.println("Error reading");
            }
        }

    }

    public synchronized void cRead(int data) {
        if (data == 0) {
            System.out.println(data);
            getTimestamp(); // Returns String
        } else {
        }

    }

Where am I doing wrong?