JSF Nested Datatable , ValueExpression

Question

Hi, I'm working on an application which is going to use a nested datatable.
basically I generate 1 datatable which consist of 7 columns , 5 rowsItems and for each column I generate a datatable to handle the data.
I make a List from RowItems and bind it to my datatable by wrapping it in a datamodel
the rowItem class consist of 7 List for each column which will be binded to each nested datatable using ValueExpression
So now the problem is:
I couldnt get the name for each display, I'm getting error message could not find property "name" for class String.
output_name.setValueExpression("value", createValueExpression("#{displaycolVar.name}", String.class));but I can get the working unit displayed correctly
output_workingunit.setValueExpression("value", createValueExpression("#{RowItemsVar.workingtime}", String.class));can someone help me on this problem?
Thanks in advance
my code
calendar.java
package demo;
import java.util.ArrayList;
import javax.el.ValueExpression;
import javax.faces.component.UIOutput;
import javax.faces.component.html.HtmlOutputText;
import javax.faces.context.FacesContext;
import javax.faces.model.ListDataModel;
import org.ajax4jsf.org.w3c.tidy.TagTable;
import org.richfaces.component.*;
import org.richfaces.component.html.HtmlDataTable;
import org.richfaces.component.html.HtmlColumn;
public class Calendar
     // Table Properties
     private String[] days = {"Working Time","Monday","Tuesday","Wednesday","Thursday","Freiday","Saturday","Sunday"};
     private String[] workingunit = {"8:00-8:45","8:45-9:30","9:30-10:15","10:15-11:00","11:00-11:45"};
     private int column; // number of columns
     private int row; // number of rows
     // Main List to store the values
     private ArrayList<RowItems> RowItemList;
     // Datatable backing bean Component
     private UIDataTable calendarDatatable;
     // Constructor
     public Calendar()
          // Initializing row and column
          column = 7;
          row = 5;
          // Initializing Datatable
          calendarDatatable = new HtmlDataTable();
          calendarDatatable.setVar("RowItemsVar");
          calendarDatatable.setRendered(true);
          // Creating List of RowItems
          RowItemList = new ArrayList<RowItems>();
          // Adding rows to the List
          for(int i = 0;i<row;i++)
               RowItemList.add(new RowItems(workingunit,column,i));
          // Creating creating 7 columns for each day + name column
          for(int i = 0; i <column+1; i++)
               UIColumn column = new HtmlColumn();
               UIOutput header = new HtmlOutputText();
               // Initializing column and header
               header.setValue(days[i]);
               column.setHeader(header);
               // the first column doesn't need a datatable
               if(i == 0)
                    // Display data
                    HtmlOutputText output_workingunit = new HtmlOutputText();
                    output_workingunit.setValueExpression("value", createValueExpression("#{RowItemsVar.workingtime}", String.class));
                    column.getChildren().add(output_workingunit);
                    System.out.println("\n"+output_workingunit.getValueExpression("value"));
               else      
                    // Create datatable for each column
                    UIDataTable datatable_nested = new HtmlDataTable();
                    datatable_nested.setVar("displaycolVar");               
                    datatable_nested.setRendered(true);
                    UIColumn column_for_nestedDT = new HtmlColumn();
                    // Display data
                    HtmlOutputText output_name = new HtmlOutputText();
                    output_name.setValueExpression("value", createValueExpression("#{displaycolVar.name}", String.class)); // <- it wont just find the property
                    // add outputtext for each column in nested datatable
                    column_for_nestedDT.getChildren().add(output_name);
                    // Add a column for each nested datatable
                    datatable_nested.getChildren().add(column_for_nestedDT);
                    * the expression value is correct I checked through println
                    switch(i)
                         case 1: datatable_nested.setValueExpression("value", createValueExpression("#{RowItemsVar.displaylist_col1}", String.class));
                                   break;
                         case 2:     datatable_nested.setValueExpression("value", createValueExpression("#{RowItemsVar.displaylist_col2}", String.class));
                                   break;
                         case 3:     datatable_nested.setValueExpression("value", createValueExpression("#{RowItemsVar.displaylist_col3}", String.class));
                                   break;               
                         case 4:     datatable_nested.setValueExpression("value", createValueExpression("#{RowItemsVar.displaylist_col4}", String.class));
                                   break;
                         case 5:     datatable_nested.setValueExpression("value", createValueExpression("#{RowItemsVar.displaylist_col5}", String.class));
                                   break;
                         case 6: datatable_nested.setValueExpression("value", createValueExpression("#{RowItemsVar.displaylist_col6}", String.class));
                                   break;
                         case 7:     datatable_nested.setValueExpression("value", createValueExpression("#{RowItemsVar.displaylist_col7}", String.class));
                                   break;                    
                    // Add the nested datatable to each column
                    column.getChildren().add(datatable_nested);
               // Adding each column to highest entity of datatable
               // 7 column will be added because there is 7 datatable
               calendarDatatable.getChildren().add(column);
          // Test data
          RowItemList.get(0).getDisplaylist_col1().add(new Display("danny",1,1));
          // Datamodel for the highest entity of datatable
          ListDataModel<RowItems>RowItemsDM = new ListDataModel<RowItems>();
          // Wrapp the data from ArrayList into DataModel object
          RowItemsDM.setWrappedData(RowItemList);
          // Adding datamodel to highest entity of datatable
          calendarDatatable.setValue(RowItemsDM);
     public UIDataTable getCalendarDatatable() {
          return calendarDatatable;
     public void setCalendarDatatable(UIDataTable calendarDatatable) {
          this.calendarDatatable = calendarDatatable;
// Methode to create a ValueExpression
private ValueExpression createValueExpression(String valueExpression, Class<?> valueType)
FacesContext facesContext = FacesContext.getCurrentInstance();
return facesContext.getApplication().getExpressionFactory().createValueExpression(
facesContext.getELContext(), valueExpression, valueType);

Answer 1

RowItems.java
package demo;
import java.util.ArrayList;
* Class to represent each column
public class RowItems
     private String workingtime;
     private int col;
     private int index;
     // List of list for each column     
     private ArrayList<Display> displaylist_col1 = new ArrayList<Display>();
     private ArrayList<Display> displaylist_col2 = new ArrayList<Display>();
     private ArrayList<Display> displaylist_col3 = new ArrayList<Display>();
     private ArrayList<Display> displaylist_col4 = new ArrayList<Display>();
     private ArrayList<Display> displaylist_col5 = new ArrayList<Display>();
     private ArrayList<Display> displaylist_col6 = new ArrayList<Display>();
     private ArrayList<Display> displaylist_col7 = new ArrayList<Display>();
     // Constructor
     public RowItems (String workingtime, int col, int index)
          this.workingtime = workingtime;
          this.col = col;
          this.index = index;
     // Getter & Setter
     public String getWorkingtime() {
          return workingtime;
     public void setWorkingtime(String workingtime) {
          this.workingtime = workingtime;
     public int getCol() {
          return col;
     public void setCol(int col) {
          this.col = col;
     public void setIndex(int index) {
          this.index = index;
     public int getIndex() {
          return index;
     public ArrayList<Display> getDisplaylist_col1() {
          return displaylist_col1;
     public void setDisplaylist_col1(ArrayList<Display> displaylist_col1) {
          this.displaylist_col1 = displaylist_col1;
     public ArrayList<Display> getDisplaylist_col2() {
          return displaylist_col2;
     public void setDisplaylist_col2(ArrayList<Display> displaylist_col2) {
          this.displaylist_col2 = displaylist_col2;
     public ArrayList<Display> getDisplaylist_col3() {
          return displaylist_col3;
     public void setDisplaylist_col3(ArrayList<Display> displaylist_col3) {
          this.displaylist_col3 = displaylist_col3;
     public ArrayList<Display> getDisplaylist_col4() {
          return displaylist_col4;
     public void setDisplaylist_col4(ArrayList<Display> displaylist_col4) {
          this.displaylist_col4 = displaylist_col4;
     public ArrayList<Display> getDisplaylist_col5() {
          return displaylist_col5;
     public void setDisplaylist_col5(ArrayList<Display> displaylist_col5) {
          this.displaylist_col5 = displaylist_col5;
     public ArrayList<Display> getDisplaylist_col6() {
          return displaylist_col6;
     public void setDisplaylist_col6(ArrayList<Display> displaylist_col6) {
          this.displaylist_col6 = displaylist_col6;
     public ArrayList<Display> getDisplaylist_col7() {
          return displaylist_col7;
     public void setDisplaylist_col7(ArrayList<Display> displaylist_col7) {
          this.displaylist_col7 = displaylist_col7;
}display.java
package demo;
public class Display
     private Person person;
     private String name;
     private int x;
     private int y;
     public Display(String name, int x, int y)
          this.person = new Person(name);
          this.name = name;
          this.x = x;
          this.y = y;
     public String getName() {
          return name;
     public void setName(String name) {
          this.name = name;
     public Person getPerson() {
          return person;
     public void setPerson(Person person) {
          this.person = person;
     public int getX() {
          return x;
     public void setX(int x) {
          this.x = x;
     public int getY() {
          return y;
     public void setY(int y) {
          this.y = y;
}