Unable to connect to chromedriver with 3.5.0

[boris-petrov]

Since I updated to Selenium 3.5.0 (using Ruby and Capybara), the following message is displayed:

Selenium::WebDriver::Error::WebDriverError:                                    
  unable to connect to chromedriver 127.0.0.1:9515

Everything works fine with Selenium 3.4.3 (and 3.4.4 but it has another issue)

Meta -

OS: Linux
Selenium Version: 3.5.0
Browser: Chromium 60.0.3112.90
ChromeDriver version: 2.31.488763

[barancev]

For issues please provide a concise reproducible test case and describe what results you are seeing and what results you expect.

See CONTRIBUTING.md

[boris-petrov]

I'm not sure what more do you need. There is no test case - Capybara/Selenium fails to connect to the ChromeDriver on start (the exact code is Capybara.current_session.current_window.resize_to(1920, 1060)). Happens only with the latest Selenium. What more could I give you?

[lmtierney]

You could start by sample code, using only selenium. We do not do support for Capybara. I've just tried starting Chromium with Selenium Ruby 3.5, Chromium 60.0.3112.78, and Chromedriver 2.31.488763 and it's fine.

[p0deje]

I also tried the following code right now:

require 'selenium-webdriver'

driver = Selenium::WebDriver.for(:chrome)
driver.manage.window.resize_to 100, 100

It worked perfectly and resized window correctly.

ChromeDriver 2.31.488774 (7e15618d1bf16df8bf0ecf2914ed1964a387ba0b)
Google Chrome Version 60.0.3112.90 (Official Build) (64-bit)

[boris-petrov]

Ok, I'll try creating a short reproduction then. I'll post it here when I'm done. Also, note we're using JRuby.

[boris-petrov]

Ok, so the problem happens only when using JRuby. Have a directory with:

Gemfile

source "https://rubygems.org"

gem "selenium-webdriver"
gem "rspec"

specs/foo_spec.rb

require_relative './spec_helper'

specs/spec_helper.rb

require 'selenium-webdriver'

driver = Selenium::WebDriver.for(:chrome)
driver.manage.window.resize_to 100, 100

And run:

sudo jruby -S gem install bundler
sudo jgem install bundler
jruby -S bundle install
jruby -S rspec specs

And you will see it fail with the error I've given in the first post. Running a rspec specs instead works fine.

[p0deje]

Thank you for additional report. I can reproduce the problem now.

This seems to be something related to how IO is handled in ChildProcess gem. I'll need to investigate and get back.

[p0deje]

Once CI shows we're good to release, I'll make a point 3.5.1 release of gem.

Thank you again for a bug report.

[boris-petrov]

@p0deje - No problem, thanks for the quick fix! Do you think this behavior of JRuby is wrong? If that's a bug, perhaps you/I could log an issue with them?

[p0deje]

I'm not sure. It seems like GeckoDriver and ChromeDriver need some real I/O in order to work correctly, but not all processes require this.

[p0deje]

3.5.1 is available on Rubygems, give it a try.

[boris-petrov]

Works like a charm, thank you!