Ajax Validations not working after using filters

I want to restrict add.xhtml from other user ..so i implemented filters ,now problem what i am facing is :

,, below there is code snippet of add.xhtml, Its Include a form with ajax features..once the user is validated add.xhtml is displayed but submit button,Ajax validation for each text box are not getting fired...where i am going wrong ?

LoginFilter.java

package filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginFilter implements Filter {

@Override
    public void init(FilterConfig config) throws ServletException {
        // If you have any <init-param> in web.xml, then you could get them
        // here by config.getInitParameter("name") and assign it as field.
    }

@Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        HttpSession session = request.getSession(false);

if (session == null || session.getAttribute("uname") == null) {
            response.sendRedirect(request.getContextPath() + "/faces/Login.xhtml"); // No logged-in user found, so redirect to login page.
        } else {
            chain.doFilter(req, res); // Logged-in user found, so just continue request.
        }
    }

@Override
    public void destroy() {
        // If you have assigned any expensive resources as field of
        // this Filter class, then you could clean/close them here.
    }

}

loginAction.java

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

@SessionScoped

public class loginAction {
    private String utype;
    private String uname;
    private String pwd;

public loginAction() {
    }

public String getUtype() {
        return utype;
    }

public void setUtype(String utype) {
        this.utype = utype;
    }

/**
     * @return the uname
     */
    public String getUname() {
        return uname;
    }

public void setUname(String uname) {
        this.uname = uname;
    }

public String getPwd() {
        return pwd;
    }

public void setPwd(String pwd) {
        this.pwd = pwd;
    }

public String validateUser()
    {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        if(getUtype().equals("Admin") && (getUname().equals("admin") && (getPwd().equals("admin"))))
        {
            return "valid";
        }
 else
        {
         facesContext.addMessage(null, new FacesMessage("Username or password is incorrect"));
        return null;
        }  
    }

}

"Ieda Ideak",

We don't have many rules here at the JavaRanch, but we do insist that you use your Real Name and not some sort of "handle" or obvious alias. If you're not sure about this, see
http://www.javaranch.com/name.jsp .