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In addition to automatically running the prepare method the [prepare interceptor|http://struts.apache.org/2.3.1.2/docs/prepare-interceptor.html] will also call a method named prepare\[ActionMethodName\].  For example, if you definedefine a prepare method and a prepareInput method andin the Action will call class that implements preparable. When the Struts 2 framework calls the input method, the prepare interceptor will call the prepareInput and the prepare methods before calling the input method.