init() method will be invoked only once in Servlet Life Cycle by Servlet Container, this could be overriden by you.
In most of the cases if you do one-time tasks such as  loading the applications properties or reading Configurations  could be done in

This method. Please see below for more details.

           public void init(ServletConfig config) throws ServletException {
                super.init(config);
              
                try {
                    String log4jPropFileName = null;
                     String legacyServiceConfig = getInitParameter(LEGACY_CONFIG);
                    log4jPropFileName = legacyProp.getProperty(LOGGING_PROPERTIES);
                    if (log4jPropFileName != null) {
                        URL url = Logger.class.getClassLoader().getResource(log4jPropFileName);
                    }
            }

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