Can not refresh view data in STRUST

I am using the JSP (STRUTS) for developing my App.
I get a list of contact. In bellow it, I make a link for each contacts.
When i view details of one contact. On click link below.
My pages:
listcontact.jsp
contactdetails.jsp
When i request a details of contact from list contact -> View successfull.
But when i refresh the contactdetails.jsp page. I got a message error:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.7 logs.
I have to use:
response.setHeader("Cache-Control","no-store");
response.setHeader("Pragma","no-cache");
But can't refresh any way this page.
Plase show me the way to solve it.
Thanks
Vu Nguyen

hi,
Here are codes
listdata = new CompanyListData();
companyList = (ArrayList) session.getAttribute("datalist_company");
if (companyList == null)
companyList = (ArrayList) listdata.getCompanyList(datasource);
session.setAttribute("total", companyList.size()+ " companies");
session.setAttribute("datalist_company", companyList);
return (mapping.findForward("success"));
And for details:
if ((addressItem==null && companyName!=null)||(addressItem==null&& companyId!="0"))
addressData = new AddressDetailData();
addressItem = addressData.getAddressItem(datasource, companyId);
session.setAttribute("addressDetail", addressItem);
I got companyID by:
String companyId = request.getParameter("companyId");
return (mapping.findForward("success"));
Please gest the problems that.
Thanks,

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