code: protected String playModuleNotApplicationCheck()
      {
          String resultMessage = null;
  
          File baseDir = project.getBasedir();
          File confDir = new File( baseDir, "conf" );
  
          File applicationConfFile = new File( confDir, "application.conf" );
          if ( applicationConfFile.length() == 0 )
          {
              resultMessage = "Empty \"conf/application.conf\" file, skipping execution";
          }
          else
          {
              File routesFile = new File( confDir, "routes" );
              if ( !routesFile.isFile() )
              {
                  resultMessage = "No \"conf/routes\" file, skipping execution";
              }
              else if ( routesFile.length() == 0 )
              {
                  resultMessage = "Empty \"conf/routes\" file, skipping execution";
              }
          }
  
          return resultMessage;
      }
docs: "play:start-server" and "play:stop-server" will be executed.