// Copyright 2007 The Apache Software Foundation
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
session, just like
, but also removes the values from the session on first use. In this way, a short-term value (such as an error message) will "survive" from an action request to a render request and then disappear.
// For flash persistence, after reading a value, get rid of it.