public static String getReturnUrlTypeClassMapper(String actionName) throws NException {
   String handlerClassName;
   String returnUrlType = NNavigationMapper.getReturnUrlTypeMapper(actionName);
   if (returnUrlType == null || "".equals(returnUrlType)) {
     String specName = actionSpecOnly(actionName);
     if ("nsf".equals(specName)) {
       specName = "default";
     }
     String defaultHandler =
         NConfiguration.getInstance()
             .get("/configuration/nsf/navigation<" + specName + ">/default-handler");
     if (defaultHandler == null || "".equals(defaultHandler)) {
       handlerClassName = "nsf.foundation.front.channel.handler.NFowardHandler";
     } else {
       handlerClassName =
           NConfiguration.getInstance()
               .get("/configuration/nsf/navigation-handlers/handler<" + defaultHandler + ">");
     }
   } else {
     handlerClassName =
         NConfiguration.getInstance()
             .get("/configuration/nsf/navigation-handlers/handler<" + returnUrlType + ">");
   }
   return handlerClassName;
 }
 private static String actionSpecOnly(String fullActionName) throws NException {
   try {
     int pathLastIndex = fullActionName.lastIndexOf(".");
     String specStr = fullActionName.substring(pathLastIndex + 1);
     String aliasStr =
         NConfiguration.getInstance()
             .get("/configuration/nsf/navigation<" + specStr + ">/navigation-alias");
     if (aliasStr != null && !"".equals(aliasStr)) {
       specStr = aliasStr;
       if ("default".equals(specStr)) specStr = "nsf";
     }
     return specStr;
   } catch (Exception e) {
     throw new NException(e);
   }
 }