code: public void execute() throws ActivityException {
  
          try {
              String language = getLanguage();
              String script = getScript();
              Object retObj = executeScript(script, language, null, null);
  
              if (retObj != null)
                  setReturnCode(retObj.toString());
          }
          catch (ActivityException ex) {
              throw ex;
          }
          catch (Exception ex) {
              logger.severeException(ex.getMessage(), ex);
              throw new ActivityException(-1, ex.getMessage(), ex);
          }
      }
docs: Execute scripts in supported languages.