FtpServerFactory factory = new FtpServerFactory();
        ListenerFactory lisnerFactory = new ListenerFactory();
        lisnerFactory.setPort(port);
        factory.addListener("default", lisnerFactory.createListener());

        if (username != null) {
            UserManager userManager = factory.getUserManager();
            BaseUser ftpUser = new BaseUser();
            ftpUser.setName(username);

        }

        @Override
        public void addListener(Class<? extends java.util.EventListener> listenerClass) {
        }

        @Override
        public <T extends java.util.EventListener> T createListener(Class<T> clazz) {
            return null;
        }

        @Override
        public jakarta.servlet.descriptor.JspConfigDescriptor getJspConfigDescriptor() {
            return null;
        }

        }

        @Override
        public void addListener(Class<? extends java.util.EventListener> listenerClass) {
        }

        @Override
        public <T extends java.util.EventListener> T createListener(Class<T> clazz) {
            return null;
        }

        @Override
        public jakarta.servlet.descriptor.JspConfigDescriptor getJspConfigDescriptor() {
            return null;
        }

        }

        @Override
        public void addListener(Class<? extends java.util.EventListener> listenerClass) {
        }

        @Override
        public <T extends java.util.EventListener> T createListener(Class<T> clazz) {
            return null;
        }

        @Override
        public jakarta.servlet.descriptor.JspConfigDescriptor getJspConfigDescriptor() {
            return null;
        }