DevTools listening on ws://127.0.0.1:9222/devtools/browser/d6cd5add-200d-4bf7-b1ec-12f743092efc and subsequent Timeout

Question

I try to run springboot application which is using selenium on heroku. Locally everything works fine, but when my application

2018-09-09T11:42:25.404810+00:00 app[web.1]: [0909/114225.404404:ERROR:gpu_process_transport_factory.cc(1007)] Lost UI shared context.
2018-09-09T11:42:25.405652+00:00 app[web.1]: 
2018-09-09T11:42:25.405742+00:00 app[web.1]: DevTools listening on ws://127.0.0.1:9222/devtools/browser/d6cd5add-200d-4bf7-b1ec-12f743092efc

and after that selenium throws an error:Timed out waiting for driver server to start.

On heroku I'm using https://github.com/heroku/heroku-buildpack-chromedriver and https://github.com/heroku/heroku-buildpack-google-chrome.

Does anyone have an idea how to solve this ?

Answer 1

Let us look at the trace logs you have shared:

• [0909/114225.404404:ERROR:gpu_process_transport_factory.cc(1007)] Lost UI shared context.

  • This error doesn't impact your @Test and you can ignore the error for the time being.
  • You can find a detailed discussion in ChromeDriver showing Lost UI Shared Context

• DevTools listening on ws://127.0.0.1:9222/devtools/browser/d6cd5add-200d-4bf7-b1ec-12f743092efc

  • This error even doesn't impact your @Test and you can ignore the error for the time being.
  • You can find a detailed discussion in DevTools listening on ws://127.0.0.1:57671/devtools/browser/8a586f7c-5f2c-4d10-8174-7a7bf50e49b5 with Selenium and Python

• You main issue is with Timed out waiting for driver server to start. and clearly indicates that your WebDriver / Server process havn't spanned and have timed out.

Solution

You need to cross check the WebDriver / Web Browser initiation/initialzation part of your code to solve this error.