Encountering the GDK_BACKEND error that does not correspond to the displays available on Debian

While attempting to execute a headless browser on a remote Debian server using Selenium, I encountered an issue. The server has Firefox 46.0.1 installed and I am using version 2.53.1 of Selenium.

Every time I try to run a specific test, the following error occurs:

org.openqa.selenium.WebDriverException: Failed to connect to binary FirefoxBinary(/usr/bin/firefox) on port 7055; process output follows: 
Error: GDK_BACKEND does not match available displays

In my code, I have initialized the Firefox driver like this:

saDriver = new FirefoxDriver();

Can someone provide assistance with this issue? Thanks!

javafirefoxselenium-webdriverdebianheadless-browser

Answer №1

Although my expertise lies more in Python than Java, I can offer a solution to the issue you are facing. Here is a method that may help:

If you encounter the error "Error: GDK_BACKEND does not match available displays," try installing pyvirtualdisplay:

pip install pyvirtualdisplay selenium

You may also need to install xvfb:

sudo apt-get install xvfb

Afterwards, consider adding this code snippet:

from pyvirtualdisplay import Display
display = Display(visible=0, size=(800, 600))
display.start()

For a complete example, see below:

from pyvirtualdisplay import Display
from selenium import webdriver

display = Display(visible=0, size=(800, 600))
display.start()

browser = webdriver.Firefox()
browser.get('http://www.python.org')

browser.close()
display.stop()

Answer №2

In order for the selenium server to open the browser, you must remember to export the display within the shell it is running on.

nohup sudo Xvfb: 10 - ac &
export DISPLAY=10

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