Error when using custom cell renderer

Sorry if this is wrong section, but honestly, this forum seems a bit unorganized and confusing xD.
Well well, to the issue. I am trying this [Swing - resizing ListCellRenderers using JTextArea and word wrap|http://forums.sun.com/thread.jspa?messageID=9977618#9977618] because I need word wrap in my list items, but it isn't going very well because I am getting this:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.String cannot be cast to status.Status$MyListItemat status.Status$MyListCellRenderer.getListCellRendererComponent(Status.java:515)
/.../>
Here is my code: pastebin (pastebinned for line numbers and to not make this post enormous)
Edited by: vigge_sWe on Jun 18, 2009 6:41 AM
Edited by: vigge_sWe on Jun 18, 2009 6:42 AM

vigge_sWe wrote:
Sorry if this is wrong section, but honestly, this forum seems a bit unorganized and confusing xD.
Well well, to the issue. I am trying this [Swing - resizing ListCellRenderers using JTextArea and word wrap|http://forums.sun.com/thread.jspa?messageID=9977618#9977618] because I need word wrap in my list items, but it isn't going very well because I am getting this:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.String cannot be cast to status.Status$MyListItemat status.Status$MyListCellRenderer.getListCellRendererComponent(Status.java:515)
/.../>Your ListModel works with Strings. Why would you expect it to return MyListItem instances all of a sudden?
You can cut with a click, but you've got to paste with a brain.

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Edited by: 811488 on 18-Nov-2010 09:44
Edited by: 811488 on 18-Nov-2010 09:45
Edited by: 811488 on 18-Nov-2010 09:45

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        ((JLabel)renderer).setHorizontalAlignment(JLabel.CENTER);
        setCellRenderer(renderer);
    *   getTableCellRendererComponent() is the only method that must be over-ridden.
    *   @param table the JTable holding cell we wish to render
    *   @param value the object which we wish to put into the cell
    *   @param isSelected boolean to allow selected cell to appear as such
    *   @param hasFocus boolean to alert as to the cell having focus
    *   @param row row of the JTable in which cell resides
    *   @param column column of the JTable in which the cell resides.
    *   @return Component the image of the value object. Not a true object but an
    *   image of the object.
    public Component getTableCellRendererComponent(JTable table, Object value,
                                boolean isSelected, boolean hasFocus, int row, int column) {
        if (isSelected) {
            setForeground(table.getSelectionForeground());
            setBackground(table.getSelectionBackground());
        } else {
            setForeground(table.getForeground());
            setBackground(table.getBackground());
        setFont(table.getFont());
        if (hasFocus) {
            setBorder( UIManager.getBorder("Table.focusCellHighlightBorder") );
            if (table.isCellEditable(row, column)) {
                setForeground( UIManager.getColor("Table.focusCellForeground") );
                setBackground( UIManager.getColor("Table.focusCellBackground") );
        } else {
            setBorder(new EmptyBorder(1, 2, 1, 2));
        String str = (value == null) ? "" : value.toString();
        BufferedReader br = new BufferedReader(new StringReader(str));
        String line;
        Vector v = new Vector();
        try {
            while ((line = br.readLine()) != null) {
                v.addElement(line);
        } catch (IOException ex) { ex.printStackTrace(); }
        setListData(v);
        if(v.size() > 1){
            table.setRowHeight(row, (table.getRowHeight()+ 3)* v.size());
        return this;
}Thank you in advance for your constructive, insightful, and applicable replies.
Jerry

Here is an entire example that shows the situation of the Frame (in this case) not updating/refreshing all of it's components when regaining focus.
To simulate the problem, simply move "something"/another window over the sample frame and then move it off. In my case the scrollbar and the headers do not reappear until I have selected a row and scrolled the table.
Here is the example code:
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.border.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
public class MultiLineCellExample extends JFrame {
MultiLineCellExample() {
    super( "Multi-Line Cell Example" );
    DefaultTableModel dm = new DefaultTableModel() {
      public Class getColumnClass(int columnIndex) {
        return String.class;
    dm.setDataVector(new Object[][]{{"aa aa aa aa aa\naa aa aa aa aa\naa aa aa aa aa","b","c"},
                                    {"A","B","C\nC"},{"x","y","z"}},
                     new Object[]{"1","2","3"});
    JTable table = new JTable( dm );
    table.setDefaultRenderer(String.class, new MultiLineCellRenderer());
    JScrollPane scroll = new JScrollPane( table );
    getContentPane().add( scroll );
    setSize( 400, 130 );
    setVisible(true);
public static void main(String[] args) {
    MultiLineCellExample frame = new MultiLineCellExample();
    frame.addWindowListener( new WindowAdapter() {
      public void windowClosing( WindowEvent e ) {
        System.exit(0);
}And here is the Renderer code:
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.border.*;
import java.awt.*;
import java.io.*;
public class MultiLineCellRenderer extends JList implements TableCellRenderer {
    public MultiLineCellRenderer() {
        setOpaque(true);
        ListCellRenderer renderer = getCellRenderer();
        ((JLabel)renderer).setHorizontalAlignment(JLabel.CENTER);
        setCellRenderer(renderer);
    public Component getTableCellRendererComponent(JTable table, Object value,
                                boolean isSelected, boolean hasFocus, int row, int column) {
        if (isSelected) {
            setForeground(table.getSelectionForeground());
            setBackground(table.getSelectionBackground());
        } else {
            setForeground(table.getForeground());
            setBackground(table.getBackground());
        setFont(table.getFont());
        if (hasFocus) {
            setBorder( UIManager.getBorder("Table.focusCellHighlightBorder") );
            if (table.isCellEditable(row, column)) {
                setForeground( UIManager.getColor("Table.focusCellForeground") );
                setBackground( UIManager.getColor("Table.focusCellBackground") );
        } else {
            setBorder(new EmptyBorder(0, 0, 0, 0));
        String str = (value == null) ? "" : value.toString();
        BufferedReader br = new BufferedReader(new StringReader(str));
        String line;
        Vector v = new Vector();
        try {
            while ((line = br.readLine()) != null) {
                v.addElement(line);
        } catch (IOException ex) { ex.printStackTrace(); }
        setListData(v);
        if(v.size() > 1){
            table.setRowHeight(row, (table.getRowHeight()+2)* v.size());
        return this;
}Please, this is a very annoying problem and I would appreciate help in solving.
Jerry

Error when using PPR in the OA page developed.

HI,
We are encountering an error when using PPR for the custom OA page being developed. I am using JDeveloper version 9.0.3.5(Build 1437) and Oracle Applications version 11.5.10.CU2. The scenario we are using PPR and the steps to reproduce the issue is mentioned below,
Scenario:
1) PPR is enabled for a custom OA page that is developed.
2) The PPR is being used to enable or disable a particular field based on the
selection of a value in a poplist in the same OA Page.
Error replication steps:
1) The user enters a value in the primary mandatory field which has to have
unique value.
2) The user selects a value from the poplist of a field which has PPR associated.
3) The user enters data in all other mandatory fields in the OA page except one
and tries to save the form and is shown a error message saying that all
mandatory fields are not entered(This is correct). Now the page gets
automatically refreshed and so the entered values are wiped off.
4) Now if the user again enters a value in the primary mandatory field (as in
step1) and if that value happens to be already existing value and then select
a value from the poplist which has PPR enabled then immediately the error
"Please enter a unique value" is entered, though we did not save the record.
The unique record validation would happen only at the time of saving the
record as per out business logic.
5) But if in Step 4 if i had entered a unique value again then the above said error
does not happen. There are few more similar kind of issues happening in the
same page because PPR is enabled.
Please note that this issue happens only when the page is deployed in a oracle
applications instance and not in JDeveloper.
Would this issue because of some cacheing problem? If Yes then how do we resolve it? Or would it be some other problem caused by our internal coding.
Any inputs for resolving this issue would be highly appreciated.
Thanks, Raja.

What works in Jdeveloper should work when deployed in iAS as well.
And PPR is an old feature given quite enough time to mature, so before we suspect OA we should investigate the code. What I do not understand is how the page refreshes in Step 3 and why does the user have to re-enter the fields just because he missed entering one mandatory field the last time.
Mandatory field validations are client validations set by making the fields 'Required'. You obviously have client validations turned off on your PPR, otherwise you would be stuck with a javascript popup on PPR. The only way you can get the "Please enter unique..." error on PPR is Server Validation. So where have you placed this validation? If it is not in the EO, is it in the AM? And are you unconditionally calling the AM validation method in your processFormRequest? The PPR will also go through processFormRequest so I hope the PPR event is in a different if-else block.

Error when using custom cell renderer

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