Problem with rescheduling the TimerTask object

Question

Hi friends,
Here is the code that I am working on right now...
I am seeing the following output on the console. Could you please fix this issue with the exception.
I am trying to reschedule the same TimerTask on the same record, but with a differrent interval.
==================================================================================================================
Starting the timer for 1
Starting the timer for 2
Starting the timer for 3
Starting the timer for 4
Time Left Over: 4002
java.lang.IllegalStateException: Task already scheduled or cancelled
Re - Starting the timer for 1 New interval: 11002
     at java.util.Timer.sched(Timer.java:358)
     at java.util.Timer.schedule(Timer.java:170)
     at timers.PurgingRecords.addRecord(PurgingRecords.java:74)
     at timers.PurgingRecords.main(PurgingRecords.java:118)
I am deleted :-( NODE: 2 temp: 2.0 seqno 3
I am deleted :-( NODE: 3 temp: 2.0 seqno 3
I am deleted :-( NODE: 4 temp: 2.0 seqno 3
==================================================================================================================
Program Code.
===========
import java.util.*;
class ThermNode
     int nodeno;
     double temp;
     int seqno;
     long ts;
     public ThermNode(int n,double t,int sno, long time)
          nodeno = n;
          temp = t;
          seqno = sno;
          ts = time;
     public String toString()
          return "NODE: "+nodeno+" temp: "+temp+" seqno "+seqno;
public class PurgingRecords
     ArrayList<ThermNode> table = new ArrayList<ThermNode>();
     long active_timeout_interval = 7000;
     Delete [] timers = new Delete[10];
     Timer time = new Timer(true);
     class Delete extends TimerTask
          int node;
          public Delete(int node)
               this.node = node;
          public void run()
               purgeEntry(node);
public PurgingRecords()
     for(int i=0; i<timers.length; i++)
          timers[i] = new Delete(i);
     public void addRecord(int nodeno)
          int index;
          if((index = exists(nodeno)) == -1)
               table.add(new ThermNode(nodeno,2,3,System.currentTimeMillis()));
               System.out.println("Starting the timer for "+nodeno);
               time.schedule(timers[nodeno],active_timeout_interval);
          else
               long interval = Math.abs(table.get(index).ts - System.currentTimeMillis());
               System.out.println("Time Left Over: "+interval);
               table.set(index, new ThermNode(nodeno,4,7,System.currentTimeMillis()));
               System.out.println("Re - Starting the timer for "+nodeno+" New interval: "+(interval+active_timeout_interval));
               timers[nodeno].cancel();
               time.schedule(timers[nodeno],(active_timeout_interval+interval));     
     private int exists(int nodeno)
          int i = -1;
          for(int j=0;j<table.size();j++)
               if(table.get(j).nodeno == nodeno)
                    return j;
          return i;
     private void purgeEntry(int nodeno)
          int index;
          ThermNode removed = null;
          if((index = exists(nodeno)) != -1)
               removed = table.remove(index);
               System.out.println("I am deleted :-( "+removed.toString());
          else
               System.out.println("Record doesnot exist for "+nodeno);
     public static void main(String[] args)
          PurgingRecords pr = new PurgingRecords();
          try
          pr.addRecord(1);
          Thread.sleep(1000);
          pr.addRecord(2);
          Thread.sleep(1000);
          pr.addRecord(3);
          Thread.sleep(1000);
          pr.addRecord(4);
          Thread.sleep(1000);
          pr.addRecord(1);
          pr.addRecord(5);
          catch(Exception e)
               e.printStackTrace();
          while(true)
}

Answer 1

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