Creating RemoteWebDriver hangs forever

[NagaKesamReddy]

Hi,

While creating the remotewebdriver, the code hangs unless i pass any keyboard signal to the command prompt on Hub machine. If a keyboard signal is passed to the hub machine, then the code resumes and creates the RemoteWebDriver and execution proceeds. But the video generated is blank.

The below line of code hangs forever unless a keyboard signal is passed to the hub machine that runs SeleniumGrid using Video Proxy.

RemoteWebDriver seleniumGridDriver = new RemoteWebDriver(new URL(hubUrl), caps);

This happens even when the session is closed and waiting to stop recording. Once a keyboard signal is passed execution continues and recording related messages are displayed in the hub machine. FInally the video returned just shows black screen for the entire duration.

Windows Edition: Windows Server 2012 R2 64-bit
Selenium Version: 3.4.0

[aimmac23]

Hi NagaKesamReddy,

That sounds a bit odd - do you think you can take a stacktrace of the hub when you think its hanging?

http://docs.oracle.com/javase/7/docs/technotes/tools/share/jstack.html

Does the hub hang only at the end of the test?

As for the blank screen - were you running the node under an RDP session? Those are known to display a blank screen when the remote session gets disconnected (Windows doesn't render anything when a user can't see it).

[NagaKesamReddy]

Hi,

I am not able to recreate the RemoteWebdriver hanging issue now. It seems to be inconsistent. If I am able to recreate in future, I can fetch and attach the stack trace of the hub.

Regarding the blank screen:
Yes, all my selenium grid nodes are running on remote desktop sessions. After seeing your comments I triggered the execution on a selenium grid node machine and logged into the node machine, using remote desktop connection, to see the screen. In between the execution I minimized the node machine. On checking the final video, it did not show me a blank screen for the duration at which i was viewing the node machine, and from the duration after node machine was minimized the video content again went blank.

Is there a solution to record the video even when the virtual selenium grid nodes are minimized or disconnected?
We do not want to provide the execution team with access to virtual Selenium grid node machines, to see the execution screens, as they may login into nodes and interrupt others sessions.

[aimmac23]

Hi, I understand the fix is create a real desktop login in the server (instead of terminal services), and install VNC to administrate the machine. The black screen is a Windows optimisation for RDP, so as far as I know there's nothing we can do about it. Thanks, Alasdair

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On 7 Aug 2017 8:33 pm, "NagaKesamReddy" ***@***.***> wrote: Hi, I am not able to recreate the RemoteWebdriver hanging issue now. It seems to be inconsistent. If I am able to recreate in future, I can fetch and attach the stack trace of the hub. Regarding the blank screen: Yes, all my selenium grid nodes are running on remote desktop sessions. After seeing your comments I triggered the execution on a selenium grid node machine and logged into the node machine, using remote desktop connection, to see the screen. In between the execution I minimized the node machine. On checking the final video, it did not show me a blank screen for the duration at which i was viewing the node machine, and from the duration after node machine was minimized the video content again went blank. Is there a solution to record the video even when the virtual selenium grid nodes are minimized or disconnected? We do not want to provide the execution team with access to virtual Selenium grid node machines, to see the execution screens, as they may login into nodes and interrupt others sessions. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#45 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AGIin6ySsTRblxaOw5VSnMM0cUTAVt-uks5sV2aMgaJpZM4Osyaj> .