code: private static File generateDefaultConfigFile() {
  		final File jaasConfFile;
  		try {
  			Path jaasConfPath = Files.createTempFile("jaas-", ".conf");
  			try (InputStream resourceStream = JaasModule.class.getClassLoader().getResourceAsStream(JAAS_CONF_RESOURCE_NAME)) {
  				Files.copy(resourceStream, jaasConfPath, StandardCopyOption.REPLACE_EXISTING);
  			}
  			jaasConfFile = jaasConfPath.toFile();
  			jaasConfFile.deleteOnExit();
  		} catch (IOException e) {
  			throw new RuntimeException("unable to generate a JAAS configuration file", e);
  		}
  		return jaasConfFile;
  	}
docs: Generate the default JAAS config file.