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As discussed in the Hello World tutorial, the value of "messageStore.message" instructs Struts 2 to first call method getMessageStore of the Action class. That method call returns a MessageStore object. The ".message" part instructs Struts 2 to call the getMessage method of the MessageStore object. The getMessage method returns a String which will be included in the HTML returned to the browser.

On One very useful feature of the Struts 2 property tag is that it will automatically convert the most common data types (int, double, boolean) to their String equivalents. To demonstrate this feature let's add a static int variable to class HelloWorldAction.

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