How to retrieve logged in user model in JSF2 Portlet

Retrieving logged in user is essential in every system, especially for logging purpose or authentication and authorization.

Steps to retrieve Liferay Logged in user in JSF portlet:
1. get the PortletRequest from JSF context

    PortletRequest portletRequest = (PortletRequest) FacesContext                                                                 .getCurrentInstance()
                                .getExternalContext().getRequest();

2. get the logged in user id

    String userId = portletRequest .getRemoteUser();

3. get the user model with Liferay API

    User user = UserServiceUtil.getUserById(Long.valueOf(userId));

Done!!