code: public ProcessExecutor exitValues(Integer... exitValues) {
      allowedExitValues = exitValues == null ? null : new HashSet<Integer>(Arrays.asList(exitValues));
      return this;
    }
docs: Sets the allowed exit values for the process being executed.
  
  @param exitValues set of exit values or <code>null</code> if all exit values are allowed.
  @return This process executor.