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:

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

Liferay Migrating User from legacy database & LDAP

Keep liferay-ui:search-container while paging

How to delete a portlet in Liferay 6.1 programmatically from code

Liferay variable $user vs $realuser

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

Difference between Liferay Mobile SDK and Liferay Screens

Service builder doesn't delete table in DB

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

How to host a newportal instance in liferay

Form submit portlet with Spring MVC

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

Liferay Table Column Description

Lifefay freemarker ADT: methods unavailable?

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

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

Customizing My Sites portlet in Liferay

Liferay database table work flow?

How to ignore Liferay user removed from LDAP errors?

Liferay migrating data into Liferay table from some legacy database

Get list of users in liferay

Customize CreateAccountAction in Liferay Portal

How to pass HTTP request to Web-Service

How can I configure AOP in Liferay Service Builder?

Portlet event send array of objects

Register multiple EventHandlers for one portlet

How to create service builder for liferay plugin project with maven

Cons of a liferay cms while website development using Community Edition

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

Liferay Maven Service Builder Portlet(Developer Studio)

Does'nt Liferay work at different ports?

commandButton action method not invoked in Liferay

AJAX Call not working in liferay 6.2.2?

Include ftl file in ext plugin

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

How to override a Language.properties from a theme?

Incorrect liferay-plugins dependency

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

liferay like restfull api mobile

Custom statuses in Liferay's workflows

Drupal Content Types in Liferay

Liferay workflow Flow(ie:Kaleo WorkFlow)

Text internationalization in Javascript using liferay-ui:message

How manage styles in Vaadin portlet in Liferay

Liferay portlet deploy timestamp

Customizing liferay Calendar portlet

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

How to upload file in relative directory

Liferay Portlets Best Practices and Coding Guidelines

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