<s:form action="doSignUP" method="POST" theme="simple">
        <s:actionerror />
        <s:actionmessage/>
</s:form>

UserAvailabilityAction .java


package com.teleparadigm.mms.application.useravailability;

import java.util.Map;

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

import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.teleparadigm.mms.application.common.Owner;
import com.teleparadigm.mms.application.login.LoginDAO;

public class UserAvailabilityAction  extends ActionSupport  implements
ServletRequestAware
{
        

        private HttpServletRequest request;

        public void setServletRequest(HttpServletRequest request){
                this.request = request;
        }

        public HttpServletRequest getServletRequest(){
                return request;
        }

        UserAvailabilityDAO uadao=new UserAvailabilityDAO();
        private String username = null;
        
        public String execute() throws Exception {
                System.out.println("UserAvailabilityAction--->"+this. 
getUsername());
                boolean result=uadao.checkUserNameAvailability(this.
getUsername().trim());
                System.out.println("result--->"+result);


                if(!result){
                        return SUCCESS;
                }else{
                        username="";
                        addActionError("error.message.user.alreadyexists");
                        addActionMessage("user already exists");
                        return SUCCESS;
                }
            }

        public String getUsername() {
                return username;
        }
        public void setUsername(String username) {
                this.username = username;
        }






}

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