a4j:param is null?

[xxmei]

In my managed bean ,i create a commandLink with param, as follows:

private HtmlCommandLink createDeleteLink(){

       HtmlCommandLink deleteLink = new HtmlCommandLink();

       FacesContext fc  = FacesContext.getCurrentInstance();

       Application app  = fc.getApplication();

       MethodExpression delMethod = app.getExpressionFactory().createMethodExpression(fc.getELContext(),"#{udevStaffWagesBean.deleteStaff}",null ,new Class<?>[0]);

     deleteLink.setActionExpression(delMethod);

     HtmlGraphicImage delImage = new HtmlGraphicImage();

     delImage.setUrl("/resources/images/icons/edit_remove.png");

       delImage.setStyle("border:0");

     UIParameter parameter = new UIParameter();

     parameter.setValue("hello")  ;

      ValueExpression ves = app.getExpressionFactory().createValueExpression(fc.getELContext(), "#{udevStaffWagesBean.keys}", String.class);

     parameter.setAssignToExpression(ves); 

     deleteLink.getChildren().add(delImage);  

     deleteLink.addActionListener(parameter);

     deleteLink.getChildren().add(parameter);

   return deleteLink;

}

but in method deleteStaff() ,the value of keys is null,why?

[pvito]

Hi, try use javax.faces.component.UIParameter instead of rg.richfaces.component.UIParameter