Xlib: the extension "RANDR" is not on the display ": 99"

Question

I ran into a problem. Every time I run my test class, it shows the following error:

Testsuite: com.lo.test.selenium.AssignCampaignTestCase Tests run: 1, Failures: 0, Errors: 1, Time elapsed: 46.991 sec ------------- Standard Error ----------------- org.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output: Xlib: extension "RANDR" missing on display ":99". *** LOG addons.manager: Application has been upgraded *** LOG addons.xpi: startup *** LOG addons.xpi: Ignoring file entry whose name is not a valid add-on ID: /tmp/anonymous4942696774897131989webdriver-profile/extensions/webdriver-staging *** LOG addons.xpi: checkForChanges *** LOG addons.xpi-utils: Opening database *** LOG addons.xpi-utils: Creating database schema *** LOG addons.xpi: New add-on [e-mail] installed in app-profile *** LOG addons.xpi: New add-on {972ce4c6-7e08-4474-a285-3208198ce6fd} installed in app-global *** LOG addons.xpi: Updating database with changes to installed add-ons *** LOG addons.xpi-utils: Updating add-on states *** LOG addons.xpi-utils: Writing add-ons list *** LOG addons.manager: shutdown *** LOG addons.xpi: shutdown *** LOG addons.xpi-utils: shutdown *** LOG addons.xpi-utils: Database closed Xlib: extension "RANDR" missing on display ":99". *** LOG addons.xpi: startup *** LOG addons.xpi: Ignoring file entry whose name is not a valid add-on ID: /tmp/anonymous4942696774897131989webdriver-profile/extensions/webdriver-staging *** LOG addons.xpi: checkForChanges *** LOG addons.xpi: No changes found at org.openqa.selenium.firefox.internal.NewProfileExtensionConnection.start(NewProfileExtensionConnection.java:109) at org.openqa.selenium.firefox.FirefoxDriver.startClient(FirefoxDriver.java:245) at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:109) 

My test class:

 package com.lo.test.selenium; import static org.junit.Assert.assertTrue; import static org.junit.Assert.fail; import java.util.Properties; import java.util.ResourceBundle; import javax.mail.Flags; import javax.mail.Folder; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.NoSuchProviderException; import javax.mail.Session; import javax.mail.Store; import org.junit.Test; import org.openqa.selenium.By; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.firefox.FirefoxDriver; import org.openqa.selenium.support.ui.ExpectedConditions; import org.openqa.selenium.support.ui.Select; import org.openqa.selenium.support.ui.WebDriverWait; public class MyExampleTestCase { private static ResourceBundle rb = ResourceBundle.getBundle("global-messages"); static WebDriver driver = new FirefoxDriver(); //Make it static in order to make one instance of this class(helps to avoid opening of 2 browsers at once) @Test public void campaignEmailTestCase() throws InterruptedException { MyExampleTestCase emTesObj = new MyExampleTestCase (); String fName = "test LO"; Integer LeadId = 570903; String campaignName = "2Get"; String SubjName = "Welcome"; //NOTE: No problem, Type without double quotes. It will work for you emTesObj.doLogin(); emTesObj.goToLeadsListPage(); emTesObj.searchByFirstName(fName); //without this also,it will work but gives you the correct navigation on UI emTesObj.waitBeforePageLoads(LeadId.toString()); //pass the Id attribute which you aspect to see after the page is loaded emTesObj.assignCampaign(LeadId, campaignName); emTesObj.readRecentEmail(SubjName); } } 

Update:

I tried the code below, but it still shows the same error after executing this code, and also showed some error with this code

 Xvfb :21 -screen 0 1024x768x24 -extension RANDR & 

It seems this code is not working properly. Can anyone help me with this?

Answer 1

Referring to my last comment, the "RANDR" missing on display ":99" log message is often not a problem. Check if any fonts are installed by running fc-match . Otherwise, your Firefox will not start, and therefore WebDriver will not be able to connect.

 org.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. 

Answer 2

create a bash script file and put the following code. Run this file before running the test.

 #!/usr/bin/env bash ##script to install the necessary dependency for headless firefox browser remove_Xvfb (){ kill -9 $(ps -ef | grep [X]vfb | awk '{print $2}') } remove_screenLock (){ Xvfb :3000 -screen 0 1024x768x16 & file="/tmp/.X3000-lock" if [ -f "$file" ]; then echo "Screen Exits..removing it and installing it again" sudo rm -rf "$file" export DISPLAY=:3000 else echo "Screen Does not Exists....Creating one" export DISPLAY=:3000 fi } yum install -y xdg-utils xorg-x11-server-Xvfb fontconfig freetype freetype-devel fontconfig-devel libstdc++ Xvfb firefox sudo ln -s /usr/lib64/firefox/firefox /usr/bin/firefox running=`ps ax | grep -v grep | grep Xvfb | wc -l` if [ $running -gt 0 ]; then echo " Xvfb is running, removing it" remove_Xvfb remove_screenLock else remove_screenLock fi 

This will create a virtual screen for your test UI database examples with the Firefox browser.