code: private String assetsDirInDevModeWithoutTrailingSlash() {
          String srcDir  = System.
                  getProperty("user.dir")
                  + File.separator
                  + "src"
                  + File.separator
                  + "main"
                  + File.separator
                  + "java";
          return srcDir + File.separator + ASSETS_DIR;
      }
docs: Used in dev mode: Streaming directly from src dir without jetty reload.