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.