Problem in displaying data in JTable

hi, can anyone tell me what I'm doing wrong here? The data is coming from a db and is stored in the alrtRslts vector. The data in the alrtRslts vector is correct. The print statement prints the data correctly.
I'm getting a classCastException when I create new JTable(data, heading).
Pls help me solve this.. I need this urgently..

[ November 01, 2004: Message edited by: KathySmith SmithL ]

To use this technique when creating JTables, the first argument (i.e. rowdata) to new JTable() must be a vector of vectors.

You are using a vector.

Thanks, I tried that.. there won't be any exception, but the display is still not coming.. is there anything else that I need to add?
Here's my changed code:

public void displayAlerts(Vector alrtRslts) {
    // display the rslts on a JTable
      Vector mydata = new Vector();
      String h1=null, h2=null, h3=null;
    int AlertRsltsize = alrtRslts.size();
    System.out.println("Alerts results size = " + AlertRsltsize );
    for (int i = 0; i < AlertRsltsize; i++) {
      SetGetGUIValues sv = (SetGetGUIValues) alrtRslts.get(i);
      // String
      String date = sv.getAlertdate();
      String desc = sv.getAlertdesc();
      String time = sv.getAlerttime();
      h1 = sv.getAlertheading1();
      h2 = sv.getAlertheading2();
      h3 = sv.getAlertheading3();
      System.out.println(desc + "  " + date  + "  " + time  + "  " + h1  + "  " + h2  + "  " + h3);
      
      Vector rowdata = new Vector();
      rowdata.add(desc);
      rowdata.add(date);
      rowdata.add(time);
      System.out.println("Getting correct data till here");
      mydata.add(rowdata);
    }
    Vector heading = new Vector();
      heading.addElement(h1);
      heading.addElement(h2);
      heading.addElement(h3);
      
      try {
       
        jtbl_Alert.setAutoCreateColumnsFromModel(true);
        jtbl_Alert = new JTable(mydata, heading);
        jtbl_Alert.setSize(new Dimension(400,400));
        resizeGUI("Alert");
        jtbl_Alert.setVisible(true);
      }
      catch (Exception e) {
        System.err.println("Exception in GUI:Creating JTable" + e);
      }
  }

Are you saying that your new code executes without any errors?

Is your problem now, that you don't see your data in your table?

Or is it that you don't see your table at all?

The new code executes without any errors.. but the table is not displayed correctly and also there is no data in it.. all I see is just a block of white patch on the GUI

Can you post any of the code you use to display it?

What I'm thinking is that you have created and displayed a table. Then you called this method. Which would have the affect of building a new table but never displaying it.

It's just an assumption.

here is a quick and dirty application that may help you out.

package testing;
 
import java.awt.*;
import javax.swing.*;
import java.util.*;
 
public class tableTest extends JFrame
{
  JTable jtbl_Alert;
 
  public tableTest()
  {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
    JPanel panel = myPanel();
 
    getContentPane().add( panel );
    setSize(400, 200);
    show();
  }
 
  public void displayAlerts() {
    // display the rslts on a JTable
    Vector mydata = new Vector();
    String h1=null, h2=null, h3=null;
    int AlertRsltsize = 10;
    for (int i = 0; i < AlertRsltsize; i++)
    {
 
      // String
      String date = "some date";
      String desc = "some desc";
      String time = "some time";
 
      h1 = "alert heading 1";
      h2 = "alert heading 2";
      h3 = "alert heading 3";
 
      Vector rowdata = new Vector();
 
      rowdata.add(desc);
      rowdata.add(date);
      rowdata.add(time);
 
      mydata.add(rowdata);
    }
    Vector heading = new Vector();
    heading.addElement(h1);
    heading.addElement(h2);
    heading.addElement(h3);
 
    try {
 
 //     jtbl_Alert.setAutoCreateColumnsFromModel(true);
      jtbl_Alert = new JTable(mydata, heading);
      jtbl_Alert.setSize(new Dimension(400,400));
 //     jtbl_Alert.setVisible(true);
    }
    catch (Exception e) {
      System.err.println("Exception in GUI:Creating JTable" + e);
    }
  }
 
  public JPanel myPanel()
  {
    JPanel panel = new JPanel(new BorderLayout());
    displayAlerts();
    jtbl_Alert.setPreferredScrollableViewportSize(new Dimension(500, 70));
 
    //Create the scroll pane and add the table to it.
    JScrollPane scrollPane = new JScrollPane(jtbl_Alert);
 
    panel.add(jtbl_Alert.getTableHeader(), BorderLayout.PAGE_START);
    panel.add(scrollPane, BorderLayout.CENTER);
    return panel;
  }
  public static void main(String[] args) {
    tableTest tt = new tableTest();
  }
}

Just cut and past it. I tried to use your conventions to make reading it quicker.

This is all the code I have to display the data in the jtable. Doesn't the stmts,
jtbl_Alert = new JTable(mydata, heading);
and
jtbl_Alert.setVisible(true);
display the data? Is there more to this to display the data seperately? This is all I found in the examples..

check out the code I posted.

Let me know if you can get it to work or not. It should be easy enought.

Create a testing package, copy and paste my code into a new class called tableTest and run it.

Thank you so much.. it works fine now.. I just added the part where u are adding the code setPreferredScrollableViewportSize and adding it to the scrollPane and it worked like a charm.