Nested Model Class + ModelDriven + Struts 2

Hi i have model class as bellow

Customer.java

package com.interactcrm.customer;

import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import com.interactcrm.customer.Customer;
import com.interactcrm.module.Module;
import com.opensymphony.xwork2.validator.annotations.RequiredFieldValidator;
import com.opensymphony.xwork2.validator.annotations.RequiredStringValidator;
import com.opensymphony.xwork2.validator.annotations.Validations;

@Entity
@Table(name = "customer", schema = "licensemanager")
@Validations
public class Customer {

private Long id;
	private String customerName;
	private String email;
	private String contact1;
	private String contact2;
	private List<Module> modules;

@Id
	@GeneratedValue
	@Column(name = "id")
	public Long getId() {
		return id;
	}

public void setId(Long id) {
		this.id = id;
	}

@Column(name = "customer_name")
	@RequiredStringValidator(message="Please enter customer name")
	public String getCustomerName() {
		return customerName;
	}

public void setCustomerName(String customerName) {
		this.customerName = customerName;
	}

@Column(name = "email")
	public String getEmail() {
		return email;
	}

public void setEmail(String email) {
		this.email = email;
	}

@Column(name = "contact1")
	@RequiredStringValidator(message="Please provide one contact")
	public String getContact1() {
		return contact1;
	}

public void setContact1(String contact1) {
		this.contact1 = contact1;
	}

@Column(name = "contact2")
	public String getContact2() {
		return contact2;
	}

public void setContact2(String contact2) {
		this.contact2 = contact2;
	}

@OneToMany(mappedBy = "customer", targetEntity = Module.class, fetch = FetchType.EAGER, cascade = CascadeType.ALL)
	public List<Module> getModules() {
		return modules;
	}

public void setModules(List<Module> modules) {
		this.modules = modules;
	}

}

Module.java

package com.interactcrm.module;

import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import com.interactcrm.customer.Customer;
import com.opensymphony.xwork2.validator.annotations.RequiredStringValidator;
import com.opensymphony.xwork2.validator.annotations.ValidatorType;

@Entity
@Table(name = "module", schema = "licensemanager")
public class Module implements Serializable {

private Long id;
	private String code;
	private String name;
	private Date expiryDate;
	private Customer customer;

@Id
	@GeneratedValue
	@Column(name = "id")
	public Long getId() {
		return id;
	}

public void setId(Long id) {
		this.id = id;
	}

@Column(name = "code")
	@RequiredStringValidator(message = "Code can not be blank", type = ValidatorType.FIELD, shortCircuit = true, trim = true)
	public String getCode() {
		return code;
	}

public void setCode(String code) {
		this.code = code;
	}

@Column(name = "name")
	@RequiredStringValidator(message = "Name can not be blank", type = ValidatorType.FIELD, shortCircuit = true, trim = true)
	public String getName() {
		return name;
	}

public void setName(String name) {
		this.name = name;
	}

@Column(name = "expiry_date")
	public Date getExpiryDate() {
		return expiryDate;
	}

public void setExpiryDate(Date expiryDate) {
		this.expiryDate = expiryDate;
	}

@ManyToOne
	@JoinColumn(name = "customer_id")
	public Customer getCustomer() {
		return customer;
	}

public void setCustomer(Customer customer) {
		this.customer = customer;
	}

}

Now on the JSP I have 1 Select list and 3 textfields

The Select field contains list of customer_id (From customer table)
and the 3 textfields contains code,name,expiryDate which is in module table

now on submit of the JSP Page 3 textfields are getting stored in the Module Object but customer id is not getting stored in the Customer object's id propery.

So for time being i did as bellow

public class ModuleAction extends ActionSupport implements ModelDriven<Module>, Preparable, ServletRequestAware {

private Module module;
	private ModuleDAO moduleDAO = new ModuleDAO();
	private HttpServletRequest request;

public Module getModel() {
		return module;
	}
	
	public void prepare() throws Exception {
		module = new Module();
	}

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

public Module getModule() {
		return module;
	}

public void setModule(Module module) {
		this.module = module;
	}

public String addModule() throws Exception {
		try {
			System.out.println("Cust Id " + request.getParameter("customerId"));
			Customer customer = new Customer();
			customer.setId(Long.valueOf(request.getParameter("customerId")));
			module.setCustomer(customer);
			moduleDAO.saveOrUpdateModule(module);
		} catch (Exception e) {
			e.printStackTrace();
			return ERROR;
		}
		addActionMessage("Module Added Successfully");
		return SUCCESS;
	}

Is there any way i can tell my ModuleAction class to store the customerId in the id property of Customer Object which is in Module Object

Bellow is my JSP

I think i did it...

i changed the name and id of <s:select to