org.openqa.selenium.remote.ProtocolHandshake createSession INFORMATION: Attempting bi-dialect session with Selenium Grid

问题

I set up a local selenium grid to test something. The build runs normal when connecting to another grid but when using the local grid the build just stops at this point:

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 T E S T S
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Running xxx.xxxxxxxxxxxx.xxx.xxxxxxxxxxx.XXXXXXXXXXXX
Sep 17, 2018 3:13:49 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFORMATION: Attempting bi-dialect session, assuming Postel's Law holds true on the remote end

No error message at all. I wasn't able to achieve anything with -X and -Dwebdriver.server.session.timeout=7200

It just hangs there and I get nothing

回答1:

This error message...

org.openqa.selenium.remote.ProtocolHandshake createSession
INFORMATION: Attempting bi-dialect session, assuming Postel's Law holds true on the remote end

As per the discussion Attempting bi-dialect session, assuming Postel's Law holds true on the remote end thread 'webdriver dispatcher' panicked at 'index out of bounds: the len is 0 but the index is 0 this issue was reproducible with Selenium Client v3.0.0-beta3 released on 2016-09-01 14:57:03 -0700 with GeckoDriver.

Simon in a comment mentioned that:

The root cause was a ClassCastException. We now catch that exception, log the thing that we were trying to parse and continue with other attempts to complete the handshake. The fix was available in Selenium Client v3.0.0-beta4.

Solution

• Upgrade JDK to recent levels JDK 8u181.
• Upgrade Selenium to current levels Version 3.14.0.
• Upgrade GeckoDriver to GeckoDriver v0.20.1 level.
• GeckoDriver is present in the specified location.
• GeckoDriver is having executable permission for non-root users.
• Upgrade Firefox version to Firefox v61.0.2 levels.
• Clean your Project Workspace through your IDE and Rebuild your project with required dependencies only.
• If your base Web Client version is too old, then uninstall it through Revo Uninstaller and install a recent GA and released version of Web Client.
• Take a System Reboot.
• Execute your Test as a non-root user.

来源：https://stackoverflow.com/questions/52369904/org-openqa-selenium-remote-protocolhandshake-createsession-information-attempti