Java Tip 136: Protect Web application control flow

Web application designers and programmers often face situations where a form submission must be protected against a rupture in the normal control flow sequence. This situation typically occurs when a user clicks more than once on a submit button before the response is sent back or when a client accesses a view by returning to a previously bookmarked page. Control flow sequence is particularly important to preserve when form submission involves transaction processing on the server.

This article proposes a well-encapsulated solution to this problem: a strategy implemented as an abstract class that leverages the Struts framework.

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