Session attributes

Question

I have a JSP page that calls itself multiple times and passes information back to itself using a vector passed as a session attribute. I am attempting to clear the attribute by using the removeAttribute() method and also calling the setAttribute() method and assigning an empty vector when the page is first called.
If after populating the session attribute I move to another page ("page X") and then come back, the page appears to have cleared the attribute/vector, but when I submit the page unto itself again the attribute/vector appears with the new information that I just passed to it ALONG WITH the old information assigned from my initial call before going to "page X". I would like to clear the information if the page is called from a page other than itelf, but somehow the old information is still being saved in the session.
Anyone know what I'm doing wrong?
Thanks for your time.
Matt

Answer 1

Thanks for the help. I have pieced out the part of the page where I attempt to reset the vector. Hopefully it is not too out of context to make any sense.
Assumptions:
- daySelected is a form object in this page (used to determine if page is called by itself
- workWeek is a vector of "workday" objects populated by this page
Code below:
if(request.getParameter("daySelected") != null){//page called by itself
//retrieve the workweek object from the previous version of this page
workWeek = (Vector) session.getAttribute("passedWorkWeek");
//dayIndex = 0-6 (Sat-Fri)
dayIndex = Integer.parseInt(request.getParameter("daySelected"));
if(request.getParameter("hourType").equals("In")){  //Time In
input = request.getParameter("hourin").trim() +":"+
request.getParameter("minuteIn").trim()+
request.getParameter("AMPMin").trim();
((WorkDay) workWeek.elementAt(dayIndex)).setTimeInEntries
(input);
}else{//hourType="Out" = Time Away
input = request.getParameter("outHours")+"."+
     request.getParameter("outFracHours") + " "+
     request.getParameter("outType").trim();
((WorkDay) workWeek.elementAt(dayIndex)).setTimeAwayEntries (input);                                              
session.setAttribute("passedWorkWeek",workWeek);
}else{//if page not called by itself or Clear Hours selected
//clear any existing vector and session attribute
workWeek.clear();
session.removeAttribute("passedWorkWeek");
//the above lines seem redundant as I am setting the attribute again, but nothing seems to work consistently
//Create empty vector for workWeek
for(int i=0; i<7; i++){
workWeek.addElement(new WorkDay(weeksDates,"", "", ""));
session.setAttribute("passedWorkWeek",workWeek);