Unable to set panel using set method.

Question

Dear friends,
I declared a class called EntryPanel in which I declared and initialized the emty panel which I later want to override with new Panel in Child classes. Now I declared an internal frame where I initialized this Panel and later I extended it by Material internal frame in this class I want to override the panel I created in EntryPanel using set but I am unable to do that I am posting the code below. I hope someone would have faced similar problem
I have created classes as below.
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.GridBagConstraints;
import javax.swing.JPanel;
import javax.swing.border.BevelBorder;
import javax.swing.border.EtchedBorder;
import noptics.client.lens.gui.AddCancelBtnPanel;
public class EntryPanel extends javax.swing.JPanel {
     private AddCancelBtnPanel btnPanel;
     private JPanel fieldPanel;
     public EntryPanel() {
          initGUI();
     * Initializes the GUI.
     public void initGUI(){
          try {
               fieldPanel = new JPanel();
               btnPanel = new AddCancelBtnPanel();
               GridBagLayout thisLayout = new GridBagLayout();
               this.setLayout(thisLayout);
               fieldPanel.setBorder(new EtchedBorder(BevelBorder.LOWERED, null, null));
               GridBagConstraints c = new GridBagConstraints();
               c.gridx = 0;
               c.gridy = 0;
               c.gridwidth = 1;
               c.gridheight = 1;
               c.weightx = 1.0;
               c.weighty = 1.0;
               c.anchor = GridBagConstraints.NORTH;
               c.fill = GridBagConstraints.BOTH;
               c.insets = new Insets(5, 5, 5, 5);
               c.ipadx = 0;
               c.ipady = 0;
               this.add(fieldPanel, c);
               c.gridy = 1;
               c.weightx = 0.0;
               c.weighty = 0.0;
               c.anchor = GridBagConstraints.NORTH;
               c.fill = GridBagConstraints.HORIZONTAL;
               c.insets = new Insets(0, 0, 5, 0);
               this.add(btnPanel, c);
          } catch (Exception e) {
               e.printStackTrace();
      * @return <code>AddCancelBtnPanel</code> -
      * This can be used to get reference to button panel. 
     public AddCancelBtnPanel getBtnPanel() {
          return btnPanel;
      * @return <code>JPanel</code> - Reference to fieldPanel;
     public JPanel getFieldPanel() {
          return fieldPanel;
      * @param <code>JPanel</code> - panel Replace with orignal Panel
      * with fields.
     public void setFieldPanel(JPanel panel) {
          fieldPanel = panel;
import javax.swing.JSplitPane;
import noptics.client.lens.gui.EntryPanel;
import noptics.client.lens.gui.ListPanel;
public class ListEntryInternalFrame extends javax.swing.JInternalFrame {
     private EntryPanel entryPanel;
     private ListPanel listPanel;
     private JSplitPane listEntrySplitPane;
      * @param string
     public ListEntryInternalFrame(String string) {
          super(string);
          initGUI();
     public ListEntryInternalFrame() {
          this("");
     * Initializes the GUI.
     public void initGUI(){
          try {
               listEntrySplitPane = new JSplitPane();
               listPanel = new ListPanel();
               entryPanel = new EntryPanel();
               this.setResizable(true);
               this.setClosable(true);
               this.setMaximizable(true);
               this.setToolTipText("Default List Entry Screen");
               this.setPreferredSize(new java.awt.Dimension(400,200));
               this.setAutoscrolls(true);
               listEntrySplitPane.setOrientation(JSplitPane.VERTICAL_SPLIT);
               listEntrySplitPane.setOneTouchExpandable(true);
               this.getContentPane().add(listEntrySplitPane);
               listEntrySplitPane.add(listPanel, JSplitPane.RIGHT);     
               listEntrySplitPane.add(entryPanel, JSplitPane.LEFT);
          } catch (Exception e) {
               e.printStackTrace();
      * @return
     public EntryPanel getEntryPanel() {
          return entryPanel;
      * @return
     public JSplitPane getListEntrySplitPane() {
          return listEntrySplitPane;
      * @return
     public ListPanel getListPanel() {
          return listPanel;
public class MaterialInternalFrame extends ListEntryInternalFrame {
     MaterialPanel material;
      * Default Constructor
     public MaterialInternalFrame() {
          this("Material Entry Screen");          
      * @param <code>String</code> - string
     public MaterialInternalFrame(String string) {
          super(string);
     public void postInitGUI() {
          material = new MaterialPanel();
          super.getEntryPanel().getFieldPanel().add(material);          
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.GridBagConstraints;
import javax.swing.JLabel;
import javax.swing.JTextField;
* This panel contains entry field for Material.
public class MaterialPanel extends javax.swing.JPanel {
     private JTextField nameTxt;
     private JLabel fieldLbl;
     private JLabel titleLbl;
     public MaterialPanel() {
          initGUI();
     * Initializes the GUI.
     public void initGUI(){
          try {
               titleLbl = new JLabel();
               fieldLbl = new JLabel();
               nameTxt = new JTextField();
               GridBagLayout thisLayout = new GridBagLayout();
               this.setLayout(thisLayout);
               thisLayout.columnWidths = new int[] {1,1};
               thisLayout.rowHeights = new int[] {1,1};
               thisLayout.columnWeights = new double[] {0.1,0.1};
               thisLayout.rowWeights = new double[] {0.1,0.1};
               // this.setPreferredSize(new java.awt.Dimension(200,100));
               titleLbl.setText("Material");
               GridBagConstraints c = new GridBagConstraints();
               c.gridx = 0;
               c.gridy = 0;
               c.gridwidth = 2;
               c.gridheight = 1;
               c.weightx = 0.0;
               c.weighty = 0.0;
               c.anchor = GridBagConstraints.NORTH;
               c.fill = GridBagConstraints.NONE;
               c.insets = new Insets(5, 0, 5, 0);
               c.ipadx = 0;
               c.ipady = 0;
               this.add(titleLbl, c);
               fieldLbl.setText("Name:");
               c.gridy = 1;
               c.gridwidth = 1;
               c.anchor = GridBagConstraints.NORTHEAST;
               c.insets = new Insets(0, 0, 0, Constants.RIGHTGAP);
               this.add(fieldLbl, c);
               nameTxt.setColumns(20);
               nameTxt.setText("Material Name");
               nameTxt.setText("Material Name");               
               nameTxt.setMaximumSize(new java.awt.Dimension(100,40));
               nameTxt.setMinimumSize(Constants.txtDimension);
               nameTxt.setPreferredSize(Constants.txtDimension);
               c.gridx = 1;
               c.gridheight = 1;
               c.weightx = 1.0;
               c.weighty = 1.0;
               c.anchor = GridBagConstraints.NORTHWEST;
               c.insets = new Insets(0, 0, 0, 0);
               this.add(nameTxt, c);
          } catch (Exception e) {
               e.printStackTrace();
}

Answer 1

Sorry, this is just a quick response...i haven't
really read your code too thoroughly.
You could try calling
super.getEntryPanel().validate(); after setting the
field panel
or super.getEntryPanel().updateUI();I have tried both but it doesn't work
when I change my postInitGUI function code as given below I am able to see the Label but the new panel I want to set is not getting set. I can add material panel in old panel but I am unable to reset that panel with new Panel.
// Function postInitGUI in MaterialInternalFrame class
public void postInitGUI() {
     super.getEntryPanel().getFieldPanel().add(new JLabel("Hello World"));
     material = new MaterialPanel();
     super.getEntryPanel().setFieldPanel(material);
}