docs: public static void main(final String[] args) throws Exception {
          final AclTool tool = new AclTool(new DefaultCLIToolLogger());
          tool.setShouldExit(true);
          int exitCode = 1; //pessimistic initial value
  
          try {
              tool.run(args);
              exitCode = 0;
          } catch (OptionsPrompt e) {
              exitCode = 2;
              tool.error(e.getMessage());
              tool.error(e.getPrompt());
              if (tool.argVerbose) {
                  e.printStackTrace();
              }
          } catch (CLIToolOptionsException e) {
              exitCode = 2;
              tool.error(e.getMessage());
              if (tool.argVerbose) {
                  e.printStackTrace();
              }
          } catch (Throwable e) {
              if (e.getMessage() == null || tool.argVerbose) {
                  e.printStackTrace();
              }
              tool.error("Error: " + e.getMessage());
          }
          tool.exit(exitCode);
      }