code: static public boolean isJaninoAvailable() {
          ClassLoader classLoader = EnvUtil.class.getClassLoader();
          try {
              Class<?> bindingClass = classLoader.loadClass("org.codehaus.janino.ScriptEvaluator");
              return bindingClass != null;
          } catch (ClassNotFoundException e) {
              return false;
          }
      }
docs: Checks if is janino available.
  
  @return true, if is janino available