Login portlet - access request or session context

I'm using jetspeed 2.2.1 and its login portlet.
When the user inputs a wrong login or password, he's being denied access and
a error message is displayed.
So far, so good.
When refreshing the page, we expect the message to disappear and the login
page to go back to its normal state. But the error message persists.

Being a jetspeed portlet i have no access to the controller, i can only
handle action via the jsp file.
To retrieve the error code, we use

<c_rt:set var="errorCode"
value="<%=((RequestContext)request.getAttribute(RequestContext.REQUEST_PORTALENV)).getSessionAttribute(LoginConstants.ERRORCODE)%>"/>

Is there any way to unset this error code from the jsp file so that when the
pasge is refreshed, we won't see the error message any more.
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