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The templateSuffix variable controls which templating engine is used to render a page. To change the engine for a particular page, change the value of the templateSuffix variable.
Change to the Velocity Engine
<s:set name="templateSuffix" value="'vm'" />
Change to the JSP engine
<s:set name="templateSuffix" value="'jsp'" />
Change to the FreeMarker engine
Freemarker is the default templating engine
<s:set name="templateSuffix" value="'ftk'" />
See also Template Loading.