JComboBox as cell in JTable

I use a JComboBox implementation as a cell in a JTable. The CombBox is editable . This is what I get when I try to type in something.
java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
at java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:1507)
at java.awt.Component.getLocationOnScreen(Component.java:1481)
at javax.swing.JPopupMenu.show(JPopupMenu.java:921)
at javax.swing.plaf.basic.BasicComboPopup.show(BasicComboPopup.java:177)
at javax.swing.plaf.basic.BasicComboBoxUI.setPopupVisible(BasicComboBoxUI.java:927)
at javax.swing.JComboBox.setPopupVisible(JComboBox.java:790)
at javax.swing.JComboBox.showPopup(JComboBox.java:775)
I read some related bugs on the sun site but I am not sure if this is a bug and if it is then has it been fixed or work-around provided.
any insights ??

Hi,
for an example implementation look here:
http://archive.devx.com/sourcebank/details.asp?resourc
eNum=1034693
L.P.I had gone through this page much earlier than this post . I already have my own CellEditor but still the problem persists .
Anyways I have managed to tweak the stopCellEditing() method and found out a workaround. I think it has to do more with the way I have implemented Auto-Complete feature rather than anything else so it wouldnt help if I post my solution.

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Hi,
I use JComboBox as cell editor in JTable. If the drop-down menu of the JComboBox out of the JTable area (as the editable cell is near the bottom of the JTable), the item in JComboBox can not be selected with mouse, in this situation there is no MouseEvent to be received in JTable. But it works when I use the keyboard to choose an item in JComboBox.

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This is the function that disable/enable cells in JTables.
Are you looking for this?
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import java.util.Vector;
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Hi;
Thanks for the reply,on using Text Area as renderer i.e using Multi-Line cells in JTable, i achieved the objective of displaying the text on multiple lines in the cell."In my Table there are 5 columns and i'm setting renderer on 3rd and 5th column,If the text is too large in column 5 it automatically gets wrapped off for all the cells in column 5.For column 3 my text is not so large as compared to column 5 and due to which the Text in the column 3 starts from the top for all the cells i.e (the first row in column 3 is parallel to first row in column 5 ),Now the problem is i can't display the text in the center of all cells for Column 3 .
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kagaw3000 wrote:
ok i got it!
But i am really confuse in JTable tutorial. it uses JLable as a CellRenderer and JButton as a CellEditor
then it returns a Color.
for clarification, when i am editing a cell, CellEditor will takes place, right? and when customizing the display of a cell, CellRendere will takes place, right?
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    java.lang.reflect.Constructor constructor;
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            Class type = table.getColumnClass(column);
            // Since our obligation is to produce a value which is
            // assignable for the required type it is OK to use the
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            // to contain Objects. A String is an Object.
            if (type == Object.class) {
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            constructor = type.getConstructor(argTypes);
        catch (Exception e) {
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}

How do i do that? MultiLine in a cell of JTable !!!

Dear friends,
I am trying to add multiline in a cell of JTable. For that bellow code i have written, but my statement in cell displays in a line only. Code is given bellow (copy/paste/run), could anyone help me how to do that?
Regards..
Jaya.
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import javax.swing.table.*;
import java.sql.*;
public class OtL extends JFrame {
    public OtL()
      initComponents();
    private void initComponents() {
        model1 = new DefaultTableModel();
        btnClose = new javax.swing.JButton();
        tblOt       = new javax.swing.JTable(model1);
        scrOt   = new javax.swing.JScrollPane();
        TableCellRenderer renderer = new TableRenderer();
        tblOt.setDefaultRenderer(Object.class,renderer);
        tblOt.setRowHeight(tblOt.getRowHeight()*3);
        tblOt.setBackground(new java.awt.Color(250,225,162));
        getContentPane().setLayout(null);
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
        btnClose.setText("CLOSE");
        btnClose.setToolTipText("Close This Screen");
        btnClose.setBorder(new javax.swing.border.BevelBorder(javax.swing.border.BevelBorder.RAISED));
        btnClose.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
              System.exit(0);
        getContentPane().add(btnClose);
        btnClose.setBounds(380, 470, 110, 25);
        tblOt.setToolTipText("Operation Theatre Booking List");
        scrOt.setViewportView(tblOt);
        tableSize();
        scrOt.setBorder(new javax.swing.border.LineBorder(new java.awt.Color(0, 0, 0)));
        scrOt.setToolTipText("Operation Theatre Booking List");
        getContentPane().add(scrOt);
        scrOt.setBounds(15, 150, 770, 300);
        displayOtList();
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    public static void main(String args[]) {
        JFrame j = new OtL();
        j.setSize(800,560);
        j.show();
/**********Code for displaying Operation Theater Booking List****Start Here*************/
    public void displayOtList(){
Here i fire a sql query and i populate data in table.
Sometime i get more than 1 value for some column e.g Surgery Name and Surgeon Name, so
i want to display more than 1 value in the same cell. like bellow i have mentiond for
5th and 6th column. But its displayin in one line only, how can i display that in multiple line!!
I know that can be taken care with Renderer, i tried but couldn't go through. I have written TableRenderer
class for that, please help me what should i do in Renderer class.
      int row1=0;
      tableSize();
      DefaultTableModel model1 = (DefaultTableModel)tblOt.getModel();
      Object[] newRow = new Object[6];
        for(int i=0;i<1;i++){
          row1 = tblOt.getRowCount() + 1;
          newRow[0] = "1";
          newRow[1] = "10:10";
          newRow[2] = "11:30";
          newRow[3] = "Name Here";
          newRow[4] = "Surgery Name1 \n Surgery Name2";
          newRow[5] = "Dr. Amit \n Dr. Johnson";
          model1.addRow(newRow);
/**********Code for displaying Operation Theater Booking List****End Here*************/
   class TableRenderer extends DefaultTableCellRenderer{
     public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean
hasFocus, int row, int column)
       super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
      setOpaque(true);
       return this;
/******tableSize()*****code for sizing table******start here()********/
public void tableSize(){
    tblOt.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {},
        new String [] {"Ot No.", "Start Time","End Time", "Patient Name", "Surgery Name","Surgeon Name"}
    TableColumn column = null;
    for (int i = 0; i < 6; i++) {
      column = tblOt.getColumnModel().getColumn(i);
      if (i == 0) {
        column.setPreferredWidth(5);
      if (i == 1) {
        column.setPreferredWidth(15);
      if (i == 2) {
      column.setPreferredWidth(15);
      if (i == 3) {
        column.setPreferredWidth(130);
      if (i == 4) {
        column.setPreferredWidth(130);
      if (i == 5) {
        column.setPreferredWidth(130);
/******tableSize()*****code for sizing table******end here()********/
    private javax.swing.JButton btnClose;
    private javax.swing.JScrollPane scrOt;
    private javax.swing.JTable tblOt;
    private DefaultTableModel model1;
[\code]

OK Filne, Thanx .. its displaying data in multiple line now.
But still there is a problem, whenever i move mouse over the table row it returns error like bellow. I am not able to findout the reason of error. I tried to put code in try{} catch{} block to avoid this error, but still its coming. Help me.....!!!!!!!!
java.lang.NullPointerException
        at javax.swing.text.View.getViewIndex(View.java:1060)
        at javax.swing.text.View.getToolTipText(View.java:1031)
        at javax.swing.plaf.basic.BasicTextUI.getToolTipText(BasicTextUI.java:1057)
        at javax.swing.text.JTextComponent.getToolTipText(JTextComponent.java:1533)
        at javax.swing.JTable.getToolTipText(JTable.java:2380)
        at javax.swing.ToolTipManager$insideTimerAction.actionPerformed(ToolTipManager.java:669)
        at javax.swing.Timer.fireActionPerformed(Timer.java:256)
        at javax.swing.Timer$DoPostEvent.run(Timer.java:190)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:167)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:437)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:131)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)my latest programe code is here :
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.border.*;
import javax.swing.table.*;
public class OtL extends JFrame {
    public OtL()
      initComponents();
    private void initComponents() {
        model1 = new DefaultTableModel();
        btnClose = new javax.swing.JButton();
        tblOt       = new javax.swing.JTable(model1);
        scrOt   = new javax.swing.JScrollPane();
        TableCellRenderer renderer = new TableRenderer();
        tblOt.setDefaultRenderer(Object.class,renderer);
        tblOt.setRowHeight(tblOt.getRowHeight()*3);
        tblOt.setBackground(new java.awt.Color(250,225,162));
        getContentPane().setLayout(null);
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
        btnClose.setText("CLOSE");
        btnClose.setBorder(new javax.swing.border.BevelBorder(javax.swing.border.BevelBorder.RAISED));
        btnClose.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
              System.exit(0);
        getContentPane().add(btnClose);
        btnClose.setBounds(380, 470, 110, 25);
        scrOt.setViewportView(tblOt);
        tableSize();
        scrOt.setBorder(new javax.swing.border.LineBorder(new java.awt.Color(0, 0, 0)));
        getContentPane().add(scrOt);
        scrOt.setBounds(15, 150, 770, 300);
        displayOtList();
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    public static void main(String args[]) {
        JFrame j = new OtL();
        j.setSize(800,560);
        j.show();
    public void displayOtList(){
      int row1=0;
      tableSize();
      DefaultTableModel model1 = (DefaultTableModel)tblOt.getModel();
      Object[] newRow = new Object[6];
        for(int i=0;i<1;i++){
          row1 = tblOt.getRowCount() + 1;
          newRow[0] = "1";
          newRow[1] = "10:10";
          newRow[2] = "11:30";
          newRow[3] = "Name Here";
          newRow[4] = "Surgery Name1 \n Surgery Name2";
          newRow[5] = "Dr. Amit \n Dr. Johnson";
          model1.addRow(newRow);
   class TableRenderer extends JTextArea implements TableCellRenderer{
      public TableRenderer(){
        setLineWrap(true);
        setWrapStyleWord(true);
        setOpaque(true);
     public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean
hasFocus, int row, int column)
      if (isSelected) {
        setForeground(tblOt.getSelectionForeground());
        setBackground(tblOt.getSelectionBackground());
      } else {
        setForeground(tblOt.getForeground());
      setFont(tblOt.getFont());
      if (hasFocus) {
        setBorder( UIManager.getBorder("Table.focusCellHighlightBorder") );
          if (tblOt.isCellEditable(row, column)) {
            setForeground( UIManager.getColor("Table.focusCellForeground") );
            setBackground( UIManager.getColor("Table.focusCellBackground") );
          } else {
        setBorder(new EmptyBorder(1, 2, 1, 2));
      setText((value == null) ? "" : value.toString());
      return this;
/******tableSize()*****code for sizing table******start here()********/
public void tableSize(){
    tblOt.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {},
        new String [] {"Ot No.", "Start Time","End Time", "Patient Name", "Surgery Name","Surgeon Name"}
    TableColumn column = null;
    for (int i = 0; i < 6; i++) {
      column = tblOt.getColumnModel().getColumn(i);
      if (i == 0) {
        column.setPreferredWidth(5);
      if (i == 1) {
        column.setPreferredWidth(15);
      if (i == 2) {
      column.setPreferredWidth(15);
      if (i == 3) {
        column.setPreferredWidth(130);
      if (i == 4) {
        column.setPreferredWidth(130);
      if (i == 5) {
        column.setPreferredWidth(130);
/******tableSize()*****code for sizing table******end here()********/
    private javax.swing.JButton btnClose;
    private javax.swing.JScrollPane scrOt;
    private javax.swing.JTable tblOt;
    private DefaultTableModel model1;
}

Merge table cells of JTable

Can we merge two cells of JTable, the way we do it in html using rowspan and colspan?

no, that's unsupported. There are some (partly oldish, google should help) experiments out there - but beware: they all require tweaks on the level of the ui-delegates which isn't a real option most of the time.
Cheers
Jeanette

JComboBox as cell in JTable

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