private FlowException clearActionRequestFlowException(RenderRequest request, RenderResponse response,
FlowHandler flowHandler) {
PortletSession session = request.getPortletSession(false);
if (session != null) {
FlowException e = (FlowException) session.getAttribute(ACTION_REQUEST_FLOW_EXCEPTION_ATTRIBUTE);
if (e != null) {
session.removeAttribute(ACTION_REQUEST_FLOW_EXCEPTION_ATTRIBUTE);
return e;
}
}