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An intermittent bug is occurring on a live struts based application. A
value is being set on a DynaActionForm variable (userId ) when a user
navigates to the screen. However when the user submits the resultant
form the value is lost (its becomes null). The bug appears on the live
system and then disappears with no apparent consistency. The
DynaActionForm is configured with session scope. The form has been
extended with an implemention of the reset method (as below) which seems
to continually set this form attribute with a value. My guess then is
that the only way this value can be null is when the form bean is first
created (it is not configured with an 'initial' value). Although using
ValidatorForm, validation is done manually rather than through the
validation configuration.
public class UserDynaValidatorForm extends DynaValidatorForm
{
public void reset(ActionMapping mapping,
javax.servlet.http.HttpServletRequest request)
{
HttpSession session = request.getSession();
DynaActionForm dynaForm =
(DynaActionForm)session.getAttribute("userInputNav");
String userId = "0";
if(dynaForm.get("userId")!=null) {
userId=(String)dynaForm.get("userId");
}
super.getMap().clear();
dynaForm.set("userId",userId);
session.setAttribute("userInputNav",dynaForm);
}
}
The application is running on Oracle9iAS Release 2 on one machine using
a two node cluster with Web Cache enabled and configured for 'sticky'
sessions.
Does anyone have any ideas about what might be happening here, and why
it might be happening, or has had experience of something similar ?
Many thanks
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