protected void loadInternalProperties() {
		Properties properties = new Properties();
		try (InputStream inputStream = new ClassPathResource("/internal.properties").getInputStream()) {
			properties.load(inputStream);
			internalProperties = new PropertiesWrapper(properties, internalPropertiesKeyMapper);
		} catch (IOException e) {
			CoreLogger.LOGGER.error("Error while load internal.properties", e);
			internalProperties = new PropertiesWrapper(properties, internalPropertiesKeyMapper);
		}
	}
Load internal properties which is not modifiable by user.
ngrinder-controller/src/main/java/org/ngrinder/infra/config/Config.java