Struts 2 JQuery Grid is not working in jsp with Integration of Strtus 2,Hibernate,Spring

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Hello,
I'm trying to display the list in Action Class which contains set of values in jsp through Struts 2 Jquery Grid Plugin. But, it throws always following Error :

root cause

org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.IllegalAccessException: Class org.apache.struts2.json.JSONWriter can not access a member of class org.hibernate.persister.entity.AbstractEntityPersister$3 with modifiers "public"
org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:230)
org.apache.struts2.json.JSONWriter.process(JSONWriter.java:160)
org.apache.struts2.json.JSONWriter.value(JSONWriter.java:126)

I included three jar files :

struts2-jquery-grid-plugin-3.3.0.jar

struts2-jquery-plugin-3.3.0.jar

struts2-json-plugin-2.3.1.2.jar

My JSP Page : [RegForm.jsp]

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
 <%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib prefix="sj" uri="/struts-jquery-tags"%>
<%@ taglib prefix="sjg" uri="/struts-jquery-grid-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Registration Form</title>
<sj:head jqueryui="true" jquerytheme="redmond" />
</head>
<body>
<fieldset style="width: 350px;">
<legend><h1><i>Registration</i></h1></legend>
<table>
		<s:form  action="saveForm!saveData"  namespace="/hibernateMapping">
			<tr>
				<td><s:textfield name="per.fname" label="Firstname"/></td>
				<td><s:textfield name="per.lname" label="Lastname"/></td>
			</tr>
			<tr>
				<td><s:select name="per.gender"  list="#{'M':'Male','F':'Female'}" label="Gender"/></td>
				<td><s:textfield name="per.age"  label="Age"/></td>
			</tr>
			<tr>
					<td><s:textfield name="per.streetNo" maxLength="5" label="Street No / Street Name"/></td>
					<td><s:textfield name="per.streetName" maxLength="30" /></td>
			</tr>
			<tr>
					<td><s:textfield name="per.locality" label="Locality" /></td>
					<td><s:textfield name="per.city" label="City" /></td>
					<td><s:textfield name="per.zipCode" label="Zip Code" /></td>
			</tr>
			<tr>
					<td><s:textfield name="per.state" label="State"/></td>
					<td><s:textfield name="per.country" label="Country"/></td>
			</tr>
			<tr>
					 <td colspan="3"><s:submit name="Save" value="Save"/></td>
			</tr>
		</s:form>
</table>
</fieldset>
<br>
<hr/>
<hr/>
<br>

<s:url id="remoteurl" action="ShowForm!showHome" namespace="/hibernateMapping"/>
    <sjg:grid
        id="gridtable"
        caption="Customer Examples"
        dataType="json"
        href="%{remoteurl}"
        pager="true"
        gridModel="listAllPerson"
        rowList="10,15,20"
        rowNum="15"
        rownumbers="true"
    >
        <sjg:gridColumn name="fname" index="fname" title="First Name" sortable="true"/>
        <sjg:gridColumn name="age" index="age" title="Age" formatter="integer" sortable="false"/>
        <sjg:gridColumn name="country" index="country" title="Country" sortable="false"/>
        <sjg:gridColumn name="city" index="city" title="City" sortable="false"/>
    </sjg:grid>
</body>
</html>

struts.xml :

MY POJO class (Bean Class)

package usg.model;

public class Person {
	private Long id;
	private String fname;
	private String lname;
	private String gender;
	private int age;
	private String streetNo;
	private String streetName;
	private String locality;
	private String city;
	private int zipCode;
	private String state;
	private String country;
	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public String getFname() {
		return fname;
	}
	public void setFname(String fname) {
		this.fname = fname;
	}
	public String getLname() {
		return lname;
	}
	public void setLname(String lname) {
		this.lname = lname;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getStreetNo() {
		return streetNo;
	}
	public void setStreetNo(String streetNo) {
		this.streetNo = streetNo;
	}
	public String getStreetName() {
		return streetName;
	}
	public void setStreetName(String streetName) {
		this.streetName = streetName;
	}
	public String getLocality() {
		return locality;
	}
	public void setLocality(String locality) {
		this.locality = locality;
	}
	public String getCity() {
		return city;
	}
	public void setCity(String city) {
		this.city = city;
	}
	public int getZipCode() {
		return zipCode;
	}
	public void setZipCode(int zipCode) {
		this.zipCode = zipCode;
	}
	public String getState() {
		return state;
	}
	public void setState(String state) {
		this.state = state;
	}
	public String getCountry() {
		return country;
	}
	public void setCountry(String country) {
		this.country = country;
	}

}

MyActionClass : [Personaction.java]

package usg.controller;

import java.util.List;
import com.opensymphony.xwork2.ActionSupport;

import usg.bo.PersonBO;
import usg.model.Person;

public class PersonAction  extends ActionSupport{

private static final long serialVersionUID = -990348549291851676L;

Person per;
List<Person> listAllPerson;
PersonBO personBO;
public String showHome()
{
	listAllPerson=personBO.listAllPerson();
	return "home";
}

public String saveData()
{
	personBO.saveData(per);
	per=null;
	return "saved";
}
public String updateDataById()
{
	per=personBO.updateDataById(per.getId());
	return "updated";
}
public String deleteDataById()
{
	personBO.deleteDataById(per);
	return "deleted";
}

public Person getPer() {
	return per;
}
public void setPer(Person per) {
	this.per = per;
}
public List<Person> getListAllPerson() {
	return listAllPerson;
}
public void setListAllPerson(List<Person> listAllPerson) {
	this.listAllPerson = listAllPerson;
}
public PersonBO getPersonBO() {
	return personBO;
}

public void setPersonBO(PersonBO personBO) {
	this.personBO = personBO;
}

}

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