user interface freeze with cron schedule

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I'm using Cron to schedule an the upload of a file to the server in specific time given by the adminstrator. i created an interface on java, where the user can choose the time of execution of the upload program, and submit the chosen values, once submitted the following method is executed:

public class Reminder {

String minute;
//static int i=0;
String heur;
String substr=",";
String patterns;
List<String> list = null;
List<String> lines = new ArrayList<>();


Timer timer;
 FTPUploadFileDemo up=new FTPUploadFileDemo();

  public void start() throws IOException {
      /************ Get the chosen values from the administrator saved in a CSV file *********************************************************/
      BufferedReader reader;
        try {
            reader = new BufferedReader(new FileReader("C:/Users/BACKENDPC1/Desktop/timer.csv"));


    String line = null;
    while ((line = reader.readLine()) != null) {
        lines.add(line);


    }} catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();}
/**********************create cron patterns *********************************************/

        patterns="";
        for(int i=0; i<lines.size();i++) {
            heur=lines.get(i).substring(0, lines.get(i).indexOf(substr));
            minute=lines.get(i).substring(lines.get(i).indexOf(substr) + substr.length());
            System.out.println("Time selected is: "+heur+","+minute);
            patterns=patterns+minute+" "+heur+" * * *|";

        }
        System.out.println(patterns);


        // Creates the scheduler.
        Scheduler scheduler = new Scheduler();
    // Schedules the task, once every minute.
        scheduler.schedule(patterns,new RemindTask());
        scheduler.start();
        try {
            Thread.sleep(1L * 60L * 1000L);
        } catch (InterruptedException e) {
            System.out.println(e);
        }
        // Stops the scheduler.
        scheduler.stop();

    }

   class RemindTask extends TimerTask  {

      public void run() {



          up.Uplaod();



      }
    }

}

the scheduling works and it runs but, every time the user interface i created user interface freeze, i don't get any error and the program keeps running but the i can't use the interface anymore. can any one help me please.

asked 55 secs ago

Amine

1

user interface freeze with cron schedule