Struts Validator Plug-In

I am using struts validator framework for validation.
I have defined my validation in validation.xml file like this.
<form name="itemCheckInForm">
<field property="quantity" depends="required,float">
<arg0 key="prompt.quantity"/>

</field>
<field property="receiveDate" depends="required,date">
<arg0 key="prompt.receiveDate"/>
<var>
<var-name>datePatternStrict</var-name>
<var-value>MM-dd-yyyy</var-value>
</var>
</field>
</form>
in the ActionForm Bean which is extending ValidatorForm I am overriding validate method like this:
public ActionErrors validate(ActionMapping mapping, HttpServletRequest request)
{
// Perform validator framework validations
ActionErrors errors = super.validate(mapping,request);
// Only need crossfield validations here

if (quantity == null || quantity.trim().length() < 1 )
{
errors.add("quantity", new ActionError("modelNumber.required"));
}
if (receiveDate == null || receiveDate.trim().length() < 1 )
{
errors.add("receiveDate", new ActionError("receiveDate.required"));
}

return errors;
}
My Action Class is:
public class ItemCheckInAction extends Action
{
/** Creates a new instance of ItemCheckInAction */
public ItemCheckInAction()
{
}
private Log log = LogFactory.getLog("com.delhicall.ErrorLog");

public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)throws Exception
{
try
{
Locale locale = getLocale(request);
MessageResources messages = getResources(request);
ActionErrors errors = new ActionErrors();
HttpSession session = request.getSession();
ItemCheckInForm newitemform = (ItemCheckInForm) form;
ItemTransactionBean itemBean = new ItemTransactionBean();
AdminModuleBean adminBean = new AdminModuleBean();
String categoryList =null;
String retmsg =null;
String employeeId ="";

String action = newitemform.getAction();
String category = newitemform.getCategory();
String itemCode = newitemform.getItem();
String parentItem = newitemform.getParentItem();
String vendorCode = newitemform.getVendorCode();
String quantity = newitemform.getQuantity();
// String uomId = newitemform.getUomList();
String receiveDate = newitemform.getReceiveDate();
String roomCode = newitemform.getRoomCode();
String siteCode = newitemform.getSiteCode();
String maintenanceCost=newitemform.getMaintenanceCost();
String maintenanceCostUom =newitemform.getCurrencyCode();
String comment =newitemform.getComment();

Collection categories = adminBean.getCategories();
request.setAttribute("categories", categories);
Collection currencies = adminBean.getCurrencies();
request.setAttribute("currencies", currencies);
// Collection uoms = adminBean.getUoms();
// request.setAttribute("uoms", uoms);
Collection sites = adminBean.getSites();
request.setAttribute("sites", sites);
if(siteCode==null || siteCode.equals(""))
{
System.out.println("inside if");
Iterator site = sites.iterator();
if(site.hasNext())
{
System.out.println("insite inner if");
ArrayList list = new ArrayList();
//list =(ArrayList) site.next();
SiteBean siteBean = (SiteBean)site.next();
System.out.println("one");
// SiteBean siteBean = (SiteBean)list.get(0);
// System.out.println("two");
siteCode = Integer.toString(siteBean.getId());
System.out.println("siteCode: "+siteCode);
}
}
Collection rooms = adminBean.getLocations(siteCode);
request.setAttribute("rooms", rooms);
if(category==null || category.equals(""))
{
Iterator cat = categories.iterator();
if(cat.hasNext())
{
ArrayList list = new ArrayList();
CategoryBean catBean = (CategoryBean) cat.next();
// CategoryBean catBean = (CategoryBean)list.get(0);
category = Integer.toString(catBean.getId());
System.out.println("category: "+category);
}
}
Collection items = adminBean.getItems(category);
request.setAttribute("items", items);
Collection vendors = adminBean.getVendors();
request.setAttribute("vendors", vendors);

if(action!=null && action.equals("save"))
{
if (log.isTraceEnabled())
{
log.trace("Performing extra validations");
}
if (quantity == null || quantity.trim().length() < 1 )
{
errors.add("quantity", new ActionError("modelNumber.required"));
}
if (receiveDate == null || receiveDate.trim().length() < 1 )
{
errors.add("receiveDate", new ActionError("receiveDate.required"));
}

if (!errors.isEmpty())
{
saveErrors(request, errors);
System.out.println("Inside Save Error");
saveToken(request);
return (mapping.findForward("error"));
// return (mapping.getInputForward());
}
//String errorMsg=itemBean.saveNewItem(itemCode,parentItem,employeeId,statusCode,serialNumber,warrentyTime,invoiceNumber,invoiceDate,vendorCode,receiveDate,pricePerUnit,purchasePrice,barCode,quantity,roomCode);
String errorMsg=itemBean.saveItemCheckIn(itemCode,parentItem,employeeId,vendorCode,receiveDate,quantity,roomCode,maintenanceCost,maintenanceCostUom,comment);

System.out.println("errorMsg: "+errorMsg);
if (errorMsg !=null && errorMsg.equals("Duplicate"))
{
// errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("item.unique"));
// return (mapping.findForward("error"));
}
if (!errors.isEmpty())
{
saveErrors(request, errors);
System.out.println("Inside Save Error");
saveToken(request);
return (mapping.findForward("error"));
// return (mapping.getInputForward());
}
}
newitemform.setAction(action);
newitemform.setCategory(category);
newitemform.setItem(itemCode);
newitemform.setParentItem(parentItem);
newitemform.setVendorCode(vendorCode);
newitemform.setQuantity(quantity);
// newitemform.setUomList(uomId);
newitemform.setReceiveDate(receiveDate);
newitemform.setRoomCode(roomCode);
newitemform.setSiteCode(siteCode);
newitemform.setMaintenanceCost(maintenanceCost);
newitemform.setCurrencyCode(maintenanceCostUom);
request.setAttribute(mapping.getAttribute(), newitemform);

}

catch (InvocationTargetException e)
{
Throwable t = e.getTargetException();
if (t == null)
{
t = e;
}
log.error("Item Entry Failed", t);
throw new ServletException("Item Entry Failed", t);
}
catch (Throwable t)
{
log.error("Item Entry Failded", t);
throw new ServletException("Item Entry Failed", t);
}

// Forward control to the specified success URI
if (log.isTraceEnabled())
{
log.trace("Forwarding to Entry page");
}
return (mapping.findForward("success"));

}
}

my problem is when I submit my jsp page and I enter incorrect value I get a dialog box stating that I have entered wrong value. But form also get submited I mean my save method is called in Action Class. I think when form is not validate I should not have access to the Action Class. Can anyone who have used validator Plug-In will check what is the problem in this code.
Thanks