src/main/java/com/alipay/remoting/config/ConfigManager.java
public static boolean getBool(String key, String defaultValue) {
        return Boolean.parseBoolean(System.getProperty(key, defaultValue));
    }
public static boolean getBool(String key, String defaultValue) {
        return Boolean.parseBoolean(System.getProperty(key, defaultValue));
    }
~~~ public helper methods to retrieve system property