Why jar console program cannot run?

[Andrew Parker]

Hi,

I built a console application on windows. It works fine when I run it on JBuilder. It has a timer to run the Socket Connection with another server and exchange data for every minute.

I built the archives - both native executable jar file and console exe file.

I run it in console window. It can display the first print line of the program: "Starting Data Exchange ..."

However, I did not see the data updating in both servers.

The console program seems running from connecting to local DB till printing out Starting Data Exchange ...

I am not sure whether the code insides the timertask has run or not. It is ok when I run it in JBuilder.

So, is it the timer bug or the classpath issue?

What may be the deployment problems?

Thanks for any kind advice.

public class DataEx {
 
   private static ConnectionPool C;
   static {
       C = PoolManager.getPoolInstance();
   }
 
   public static void main(String args[])
   {
       System.out.println("Starting Data Exchange ...");
 
       java.util.Timer clock = new java.util.Timer(true);
       clock.scheduleAtFixedRate(new java.util.TimerTask()
       {
          public void run() {
            DataEx main = null;
            try {
               main = new DataEx();
            } catch (IOException e) {
                 System.out.println("Exception initialising DataEx " + e);
            }
 
            main.DBConnection(); // Check new data from local DB
            if (!Vector.isEmpty()) {
              System.out.println("There are " + Vector.size() + " numbers of update data.");
              main.dataexchange(); // Connect to remote server to check new data and update
            }
            else {
              System.out.println("There is no update data.");
            }
          }
        },0,60000); //run now for 60 seconds interval
   }
}

[Dirk Schreckmann]

Andrew, you've posted a most incomplete code example. Also, I'm thinking that this might be a bit beyond the beginner level we aim for in this forum.

So, how about some more complete code and then we figure out a better forum for this conversation?

[Andrew Parker]

Yes, it is complete code in main method. except

main.DBConnection();
main.dataexchange();

I added println in the above 2 methods to check whether they are executed and I did not see the println. Do you think it is the timer issue?

If I placed in the wrong forum, can you help me move to the proper level?

Thanks for help.

[Dirk Schreckmann]

There's more than those two things missing from your posted code. Did you even try it?

At any rate, perhaps the following excerpt from the Timer class documentation helps to shed some light on your troubles.

After the last live reference to a Timer object goes away and all outstanding tasks have completed execution, the timer's task execution thread terminates gracefully (and becomes subject to garbage collection).

[Dirk Schreckmann]

See what the following code does, if you don't close that JOptionPane, and just let it sit there for some time more than 60 seconds.

import javax.swing.JOptionPane;
 
 
public class Foo
{
  public static void main(String args[])
  {
    System.out.println("Starting Data Exchange ...");
 
    java.util.Timer clock = new java.util.Timer(true);
    clock.scheduleAtFixedRate(new java.util.TimerTask()
    {
      public void run()
      {
        System.out.println("hi");
      }
    }, 0, 60000); //run now for 60 seconds interval
 
    int nothing = JOptionPane.showConfirmDialog(null, "");
    System.out.println(clock);
  }
}

[Dirk Schreckmann]

Moving this to the Intermediate forum...
[ August 25, 2004: Message edited by: Dirk Schreckmann ]