Sending AT command TakeOffCommand [ID=REF, param=,290718208] non-stop

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I am working on AR.Drone 2.0 control application. I am using javadrone API and library in my project. Here is my code problem: whenever I press TakeOff button in my application, it will keep on sending takeoff commands to drone. Any idea why this will happen? And how to solve this? Thanks.

My code : 
 private void jButtonTakeOffActionPerformed(java.awt.event.ActionEvent evt){
 try
 {     
    // Take off
    System.err.println("Taking off");
    drone.takeOff();
    Thread.sleep(5000);
    }catch (IOException ex) {  
        Logger.getLogger(arDroneFrame.class.getName()).log(Level.SEVERE, null, ex);
    } catch (InterruptedException ex) {
        Logger.getLogger(arDroneFrame.class.getName()).log(Level.SEVERE, null, ex);
    }  
}  

Output of the code:

Taking off

3066 [AWT-EventQueue-0] DEBUG ardrone.ARDrone - State changed from CONNECTING to TAKING_OFF

3066 [Thread-6] DEBUG ardrone.CommandSender - Q[1]Sending AT command TakeOffCommand [ID=REF, param=,290718208]

3166 [Thread-6] DEBUG ardrone.CommandSender - Q[1]Sending AT command TakeOffCommand [ID=REF, param=,290718208]

3266 [Thread-6] DEBUG ardrone.CommandSender - Q[1]Sending AT command TakeOffCommand [ID=REF, param=,290718208]

[These TakeOff AT commands will continuously send to drone]

asked 1 min ago

Dennis QT

1

Sending AT command TakeOffCommand [ID=REF, param=,290718208] non-stop