code: public void enableLocking() {
  		if (validState) {
  			throw new InvalidStateException();
  		}
  		if (Boolean.getBoolean(Constants.PROP_IO_LOCKING)) {
  			useLock = false;
  			log.info("Disabled Locking in System Property (" + Constants.PROP_IO_LOCKING + ")");
  		} else {
  			useLock = true;
  			log.info("Enabled Locking");
  		}
  	}
docs: Enable Lock of files (default is not enabled), call before use {@link #open()}