code: protected char[] getPasswordFromConfig(String name) {
  		char[] pass = null;
  		if (getBoolean(CredentialProvider.CLEAR_TEXT_FALLBACK,
  				CommonConfigurationKeysPublic.
  						HADOOP_SECURITY_CREDENTIAL_CLEAR_TEXT_FALLBACK_DEFAULT)) {
  			String passStr = get(name);
  			if (passStr != null) {
  				pass = passStr.toCharArray();
  			}
  		}
  		return pass;
  	}
docs: Fallback to clear text passwords in configuration.
  @param name
  @return clear text password or null