i have the following action class:
package com.pendulum.web;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.pendulum.dao.DocumentoDAO;
import com.pendulum.domain.Documento;
import com.pendulum.domain.DocumentoPK;
public class DocumentoAction extends ActionSupport implements ModelDriven<Documento>{
private static final long serialVersionUID ...