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 // 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,
// See the License for the specific language governing permissions and
// limitations under the License.
The "flash" strategy stores data inside the session, just like SessionPersistentFieldStrategy, 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.
Prefix used to identify keys stored in the session.
    static final String PREFIX = "flash:";
    public FlashPersistentFieldStrategy(Request request)
    protected void didReadChange(Session sessionString attributeName)
        // For flash persistence, after reading a value, get rid of it.
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