Get list of users in liferay

Question:

I want to display users list on liferay. and I am having problem with it. Here is my action class.

public void userList(ActionRequest actionRequest, ActionResponse actionResponse) throws SystemException {
    // Todo Logic for user code
    try {
        int countUser = UserLocalServiceUtil.getUsersCount();
        log.info("User Present In DB" + countUser);
        List < User > users = UserLocalServiceUtil.getUsers(0, countUser);
        PortletSession sessions = actionRequest.getPortletSession();
        sessions.setAttribute("users", users);
        log.info("Session set from My Portlet" + sessions.getAttribute("users"));
        for (User user: users) {
            if (user != null) {
                log.info("UserID--:" + user.getUserId() + "UserCompanyID-:" + user.getCompanyId() + "UserEmail-:" + user.getEmailAddress() +
                    "UserScreenName--:" + user.getScreenName());
            }
        }

and how I am trying to get the users list on jsp.

<%@page import="com.test.UserList.userList"%>
<%@page import="java.util.ArrayList"%>
<%@page import="com.liferay.portal.model.User"%>
<%@page import="java.util.List"%>
<%@page import="javax.portlet.PortletSession"%>
<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<%@taglib uri="http://alloy.liferay.com/tld/aui" prefix="aui" %>

<portlet:defineObjects />
<%
     PortletSession session2 = renderRequest.getPortletSession();
     ArrayList<User> users = (ArrayList) session2.getAttribute("users");

     if(users!=null){
%>
    <b>Name: </b><%=users.get(users) %>
<%} %>

and i am getting the value is null i want to display all the users name in list

There is no issue with your logic in putting user-list in session, the list is getting populated and set in session accurately. However, on JSP, there are couple of issues:

1. renderRequest is undefined.
2. Cast exception (UnmodifiableList cannot be cast to java.util.ArrayList) for user-list.
3. You are not iterating list and getting user objects properly.

So, you need to do as following on your JSP:

<%@page import="java.util.ArrayList"%>
<%@page import="javax.portlet.RenderRequest"%>
<%@page import="com.liferay.portal.model.User"%>
<%@page import="javax.portlet.PortletSession"%>

<%
    RenderRequest renderRequest = 
        (RenderRequest) request.getAttribute("javax.portlet.request");
    PortletSession session = renderRequest.getPortletSession();
    List<User> users = (List<User>) session.getAttribute("users");

    if(users != null){
        for(User user : users){
%>
            <b>Name: </b><%=user.getLastName() + ", " + user.getFirstName() %><br />
        <%}
    }%> 

(Tested Code)

Related:

Drupal Content Types in Liferay

Keep liferay-ui:search-container while paging

Liferay Portlets Best Practices and Coding Guidelines

Liferay database table work flow?

Custom statuses in Liferay's workflows

AJAX Call not working in liferay 6.2.2?

Service builder doesn't delete table in DB

How to upload file in relative directory

Does'nt Liferay work at different ports?

How can I configure AOP in Liferay Service Builder?

Customizing My Sites portlet in Liferay

Portlet event send array of objects

Customize CreateAccountAction in Liferay Portal

Creating a Velocity template for Dynamic Data List (Liferay 6.2)

Liferay portlet deploy timestamp

Difference between Liferay Mobile SDK and Liferay Screens

How to host a newportal instance in liferay

Liferay Table Column Description

Include ftl file in ext plugin

I am working on a MVC Portlet and the document i am saving is not going to db

Text internationalization in Javascript using liferay-ui:message

Incorrect liferay-plugins dependency

Cons of a liferay cms while website development using Community Edition

Liferay workflow Flow(ie:Kaleo WorkFlow)

commandButton action method not invoked in Liferay

How to override a Language.properties from a theme?

Get list of users in liferay

How to pass HTTP request to Web-Service

Liferay variable $user vs $realuser

Form submit portlet with Spring MVC

Customizing liferay Calendar portlet

How to pass data from page to Portlet class through AJAX call?

liferay like restfull api mobile

How can I change the zIndex attribute of aui-datepicker in Liferay Portlet 6.2

Liferay Maven Service Builder Portlet(Developer Studio)

Liferay Migrating User from legacy database & LDAP

how to show values associate with a custom document in liferay 6.2

How to delete a portlet in Liferay 6.1 programmatically from code

How to ignore Liferay user removed from LDAP errors?

How to add a custom section to the User Edit Screen in Liferay?

How to create service builder for liferay plugin project with maven

In liferay market place, I am unable to submit the project

Liferay migrating data into Liferay table from some legacy database

Lifefay freemarker ADT: methods unavailable?

Register multiple EventHandlers for one portlet

How to check for real liferay user after altering the request through Burpsuite

how to bypass the necessity of having to have email address firstname and lastname in liferay to import authenticating users

Identify that the logged in user is an administrator or not using velocity

Users in Guest role see default theme instead custom one for given layouts

How manage styles in Vaadin portlet in Liferay