Issue with same order being modified in multiple sessions upon simultaneous multiple login.

Hi,
I am facing a issue in the following scenario.
1. User logs into the site from firefox and chrome browsers with the same login credentials simultaneously.
2. From Firefox session, the user removes some items from his cart.
3. Now the user refreshes the cart page in chrome. The console throws a "RemovedItemException" and the page breaks.
Reason:
This issue occurs since both the user sessions are referring the same order object. The session scoped ShoppingCart component object holds the references to the commerce items that have been modified / removed from the order in other session. Now when it tries to access these objects, it throws a "RemovedItemException". In our site the error gets thrown from the mincart page fragment which first tries to access the removed items. I can put a <c:catch> tag to wrap and catch the exception but how can this be gracefully handled?
Please provide any ideas, solutions or suggestions if you have encountered a similar issue.
Below is the stack trace of the error:
Caused by: org.apache.jasper.JasperException: An exception occurred processing JSP page /cart/json/cartItems.jsp at line 16
13: <c:set var="itemsQuantity" value="${0}"/>
14: <c:forEach var="item" items="${items}">
15: <dsp:param name="item" value="${item}"/>
16: <dsp:getvalueof var="commerceItemClassType" param="item.commerceItemClassType"/>
17: <c:if test="${commerceItemClassType != 'giftWrapCommerceItem'}">
18: <c:set var="itemsQuantity" value="${itemsQuantity + item.quantity}"/>
19: </c:if>
Stacktrace:
at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:498)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:638)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:543)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:480)
at atg.servlet.WrappingRequestDispatcher.include(WrappingRequestDispatcher.java:116)
at atg.servlet.ServletUtil.invokeInclude(ServletUtil.java:3858)
at atg.taglib.dspjsp.IncludeTag.doEndTag(IncludeTag.java:812)
at org.apache.jsp.cart.json.cartContentsData_jsp._jspx_meth_dsp_005finclude_005f1(cartContentsData_jsp.java:701)
at org.apache.jsp.cart.json.cartContentsData_jsp._jspx_meth_c_005fotherwise_005f1(cartContentsData_jsp.java:673)
at org.apache.jsp.cart.json.cartContentsData_jsp._jspx_meth_c_005fchoose_005f1(cartContentsData_jsp.java:585)
at org.apache.jsp.cart.json.cartContentsData_jsp._jspx_meth_dsp_005fpage_005f1(cartContentsData_jsp.java:528)
at org.apache.jsp.cart.json.cartContentsData_jsp._jspService(cartContentsData_jsp.java:121)
... 178 more
Caused by: atg.repository.RemovedItemException: Attempt to use an item which has been removed: commerceItem:ci2126000003
at atg.adapter.gsa.ItemTransactionState.<init>(ItemTransactionState.java:385)
at atg.adapter.gsa.GSAItem.getItemTransactionState(GSAItem.java:2358)
at atg.adapter.gsa.GSAItem.getItemTransactionState(GSAItem.java:2301)
Thanks,
Tejas

Hi Nitin,
Thanks for the approach. However, this is an OOTB issue in CommerceReferenceStore module (was able to reproduce the same behavior in a OOTB CRS application as well) . The issue can occur not only when accessing a removed commeceitem but also during the checkout stages if user modifies the cart in a different session during checkout, the application would throw similar errors.
Is there a way using which i can reload the order object (something like refreshOrder pipeline) whenever i see a similar error? I did not find any OOTB droplet that can reload the order object from the DB.
Please suggest.
Thanks,
Tejas

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