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Apache Struts 2 Documentation
Action Mapper & Action Mapping
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The ActionMapper fetches the ActionMapping object corresponding to a given request. Essentially, the ActionMapping is a data transfer object that collects together details such as the Action class and method to execute. The mapping is utilized by the Dispatcher and various user interface components. It is customizable through `struts.mapper.class` entry in `struts.properties`.

## Customize

Custom ActionMapper must implement ActionMapper interface and have a default constructor.

    struts.mapper.class=foo.bar.MyCustomActionMapper

    public class MyCustomActionMapper implements ActionMapper {
      public ActionMapping getMapping(HttpServletRequest request,
                                      ConfigurationManager configManager) {
        ....
      }

      public String getUriFromActionMapping(ActionMapping mapping) {
        ....
      }
    }

## Next: Action Proxy & ActionProxy Factory