HttpSession attribute getting removed abnormally after adding - spring

Question

*After I add a session attribute using
WebUtils.setSessionAttribute(request, VBWebConstants.SESSION_ORDER_BEAN,sellerDetails);
#RequestMapping(value="/minasidor/step1",method=RequestMethod.GET)
public ModelAndView step1(HttpServletRequest request,HttpSession session){
if(logger.isTraceEnabled())logger.trace("VbSellerController ::: step1 ::: start");
if(logger.isDebugEnabled())logger.debug("[Order Step1] [Start]");
ModelAndView mav=new ModelAndView("vz-new/mina-sidor/v-orderstep1");
LoginBean user = (LoginBean) WebUtils.getSessionAttribute(request, VBWebConstants.SESSION_USER);
mav.addObject("submenu",3);
if(!checkOrderLifeCycle()){
mav.addObject("orderNotAllowed", false);
return mav;
}
try{
String orderValue = "";
orderValue = InMemoryCache.getCaProperty(PropertyEnum.MIN_ORDER_VALUE.getDatabasekey());
int minimumOrderValue = CawebUtil.isInt(orderValue);
CpSellerDetails sellerDetails=vbOrderService.getStep1Data(user.getGrp_seller_id(),user.getCatalogue_id());
if(sellerDetails != null){
mav.addObject("productlist",sellerDetails.getSellerList());
mav.addObject("totalValue",sellerDetails.getTotalOrderValue());
mav.addObject("allowedfororder",sellerDetails.getTotalOrderValue() > minimumOrderValue);
// mav addobject add discount details Discount Object ArrayList
WebUtils.setSessionAttribute(request, VBWebConstants.SESSION_ORDER_STEP_COMPLETED,"step1");
WebUtils.setSessionAttribute(request, VBWebConstants.SESSION_ORDER_BEAN,sellerDetails);
}else{
mav.addObject("allowedfororder",false);
WebUtils.setSessionAttribute(request, VBWebConstants.SESSION_ORDER_STEP_COMPLETED,null);
}
}catch(DataNotFoundException e){
logger.trace("Exception in retrieving data for step1",e);
if(logger.isDebugEnabled())logger.debug("[Order Step1 Exception]",e);
}
if(logger.isTraceEnabled())logger.trace("VbSellerController ::: step1 ::: end");
if(logger.isDebugEnabled())logger.debug("[Order Step1] [end]");
return mav;
}
Within this step1 method the VBWebConstants.SESSION_ORDER_BEAN session attribute is getting removed instantly after the step1() method finishes executing where as the other session attributes remains the same.When i debug the below Http Listener class
public class MyHttpSessionListener implements HttpSessionListener,HttpSessionAttributeListener {
public static final Logger logger = Logger.getLogger(MyHttpSessionListener.class);
public void sessionCreated(HttpSessionEvent se) {
//String ipAddr = ((ServletRequestAttributes)RequestContextHolder.currentRequestAttributes()).getRequest().getRemoteAddr();
HttpSession session = se.getSession();
if(logger.isDebugEnabled()){
StringBuilder sbuilder = new StringBuilder();
sbuilder.append("\n").append("----------- Session Created -------------- ");
Enumeration<String> sessionAttrs = session.getAttributeNames();
while (sessionAttrs.hasMoreElements()) {
String name = sessionAttrs.nextElement();
sbuilder.append("\n").append(" session created ").append(name);
}
sbuilder.append("\n").append(" session created time "+ CawebUtil.getTimeStampInString(new Timestamp(session.getCreationTime())));
sbuilder.append("\n").append("---------------------------------------------------- ").append("\n");
logger.debug(sbuilder.toString());
}
}
public void sessionDestroyed(HttpSessionEvent se) {
HttpSession session = se.getSession();
if(logger.isDebugEnabled()){
try{
String ipAddr = ((ServletRequestAttributes)RequestContextHolder.currentRequestAttributes()).getRequest().getRemoteAddr();
logger.debug(" session destroyed " +ipAddr);
}catch (Exception e) {
}
}
}
public void attributeAdded(HttpSessionBindingEvent se) {
String ipAddr = ((ServletRequestAttributes)RequestContextHolder.currentRequestAttributes()).getRequest().getRemoteAddr();
HttpSession session = se.getSession();
if(logger.isDebugEnabled()){
StringBuilder sbuilder = new StringBuilder();
sbuilder.append("\n").append("----------- Attribute added -------------- from ").append(ipAddr);
sbuilder.append("\n").append(" session max inactive time "+ session.getMaxInactiveInterval());
sbuilder.append("\n").append(" session id "+ session.getId());
sbuilder.append("\n").append(" session attribute added "+ se.getName()).append(" = ").append(se.getValue());
sbuilder.append("\n").append(" session created time "+ CawebUtil.getTimeStampInString(new Timestamp(session.getCreationTime())));
}
}
public void attributeRemoved(HttpSessionBindingEvent se) {
if(logger.isDebugEnabled() ){
StringBuilder sbuilder = new StringBuilder();
sbuilder.append("\n").append("----------- Attribute removed -------------- from ");//.append(ipAddr);
sbuilder.append("\n").append(" session attribute removed "+ se.getName()).append(" = ").append(se.getValue());
}
}
public void attributeReplaced(HttpSessionBindingEvent se) {
if(logger.isDebugEnabled()){
StringBuilder sbuilder = new StringBuilder();
sbuilder.append("\n").append("----------- Attribute replaced -------------- from ");//.append(ipAddr);
sbuilder.append("\n").append(" session attribute "+ se.getName()).append(" = ").append(se.getValue());
}
}
}
I found that the session attribute is getting removed.Checked through the entire code I couldn't find what's the reason...???
Here is the CPSellerDetails class which i try to add to the session there are other 2 session attributes among which one is a string object and other is a bean.could it the size of the class that is the cause for session attribute being removed abnormally
public class CpSellerDetails implements Serializable{
/**
*
*/
private static final long serialVersionUID = -4627284179051380310L;
private List<SellerProduct> sellerList ;
private float totalOrderValue ;
private VbCpInfoBean cpinfoBean;
private Integer orderno;
private float invoiceAmount;
private Date orderedDate;
private ArrayList<DiscountVO> discounts;
private Address billingInfo;
public VbCpInfoBean getCpInfoBean() {
return cpinfoBean;
}
public void setCpInfoBean(VbCpInfoBean infoBean) {
this.cpinfoBean = infoBean;
}
public List<SellerProduct> getSellerList() {
return sellerList;
}
public void setSellerList(List<SellerProduct> sellerList) {
this.sellerList = sellerList;
}
public float getTotalOrderValue() {
return totalOrderValue;
}
public void setTotalOrderValue(float totalOrderValue) {
this.totalOrderValue = totalOrderValue;
}
public float getInvoiceAmount() {
return invoiceAmount;
}
public void setInvoiceAmount(float invoiceAmount) {
this.invoiceAmount = invoiceAmount;
}
public Integer getOrderno() {
return orderno;
}
public void setOrderno(Integer orderno) {
this.orderno = orderno;
}
public Date getOrderedDate() {
return orderedDate;
}
public void setOrderedDate(Date orderedDate) {
this.orderedDate = orderedDate;
}
public ArrayList<DiscountVO> getDiscounts() {
return discounts;
}
public void setDiscounts(ArrayList<DiscountVO> discounts) {
this.discounts = discounts;
}
public Address getBillingInfo() {
return billingInfo;
}
public void setBillingInfo(Address billingInfo) {
this.billingInfo = billingInfo;
}
}*