Java CheckBox TableCellRenderer bad behavior

Question

I'm having a strange problem with my custom TableCellRenderer for Checkbox rendering, which works correctly on the first line but on the others, it sets un/selected all the checkboxes between first click and second one. Here's the code :

/*This Class is meant to be the Concrete Aspect*
*              of CheckBox in JTable           */

public class CheckItem{
private String label;
private boolean isSelected=false;

public CheckItem(String label){
    this.label=label;
}

public boolean isSelected(){
    return isSelected;
}

public void setSelected(boolean isSelected){
    this.isSelected=isSelected;
}

@Override
public String toString(){
    return label;
}
}

and now the Renderer I use :

/*This Class is a renderer simulating a CheckBox in JTable Column(s)*/

public class CheckTableRenderer extends JCheckBox
    implements TableCellRenderer{

@Override
public Component getTableCellRendererComponent(JTable table,
        Object value, boolean isSelected, boolean hasFocus, 
        int row, int column) {
    if(value==null){
        return null;
    }

    if (isSelected) {
            setForeground(table.getSelectionForeground());
            setBackground(table.getSelectionBackground());
    } 
    else {
            setForeground(table.getForeground());
            setBackground(table.getBackground());
    }

    CheckItem prov=(CheckItem)value;

    if(!prov.toString().equals("")){
        this.setText(prov.toString());
    }       
    else 
        setHorizontalAlignment(CENTER);

    this.setSelected(prov.isSelected());

    return this;
} 
}

and finally the mouseListener to change the value, contained in class Listeners :

public static MouseListener createCheckMouseListener(final JTable table,final int column){

    MouseListener m=new MouseAdapter() {
        public void mouseClicked(MouseEvent e){
            final int x=table.getSelectedRow();
            final int y=table.getSelectedColumn();

            if((y==column || column==-1)&& y==table.columnAtPoint(e.getPoint())){
                try{
                    CheckItem item=(CheckItem)table.getValueAt(x,y);
                    item.setSelected(!item.isSelected());
                    table.repaint(table.getCellRect(x,y,false));
                }catch(java.lang.NullPointerException e2){
                    System.out.println("ERREUR!!!!");
                }
            }
        }
    };

    return m;
}

and its association : mytable.addMouseListener(Listeners.createCheckMouseListener);

All this code seems to be correct but the result is not good concerning rows, first one excepted. It works using Boolean instead of CheckItem but I need to put a String in the checkbox. I can't fix it and I'm even wondering if the problem is located in these parts... Can you help me?

Thanks.

Here's an example : SSCCE