"Could not create screenshot source" traceback on MacOS

[ipadalko]

I'm getting the traceback on my MacOS
06:08:51.634 INFO - Selenium build info: version: '3.4.0', revision: 'unknown'
06:08:51.638 INFO - Launching a Selenium Grid node
06:08:53.110 INFO - Will attempt to record at 30 frames per second - adjust this value by setting -Dvideo.framerate=
Exception in thread "main" java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.openqa.grid.web.utils.ExtraServletUtil.createServlet(ExtraServletUtil.java:38)
at org.openqa.grid.internal.utils.SelfRegisteringRemote.addExtraServlets(SelfRegisteringRemote.java:291)
at org.openqa.grid.internal.utils.SelfRegisteringRemote.(SelfRegisteringRemote.java:101)
at org.openqa.grid.selenium.GridLauncherV3$3.launch(GridLauncherV3.java:286)
at org.openqa.grid.selenium.GridLauncherV3.main(GridLauncherV3.java:99)
Caused by: java.lang.IllegalStateException: Could not create screenshot source for video encoder
at com.aimmac23.node.VideoRecordController.(VideoRecordController.java:75)
at com.aimmac23.node.servlet.VideoRecordingControlServlet.(VideoRecordingControlServlet.java:47)
... 7 more
Caused by: java.awt.AWTException: headless environment
at java.awt.Robot.(Robot.java:91)
at com.aimmac23.node.RobotScreenshotSource.(RobotScreenshotSource.java:21)
at com.aimmac23.node.VideoRecordController.(VideoRecordController.java:64)
... 8 more

The start script is:
java -cp selenium-video-node-2.3.jar:selenium-server-standalone-3.4.0.jar -Dvideo.framerate=30 org.openqa.grid.selenium.GridLauncherV3 -servlets com.aimmac23.node.servlet.VideoRecordingControlServlet -proxy com.aimmac23.hub.proxy.VideoProxy -role wd -nodeConfig ios-node-config.json

The node config:
$ cat ios-node-config.json
{
"capabilities": [
{
"browserName": "safari",
"version" : "10.1.1",
"maxInstances": 1,
"platform": "MAC"
}
],
"proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy",
"port": 5555,
"hub":"http://10.8.68.100:8844",
"maxSession": 1,
"register": true,
"registerCycle": 5000,
"nodeStatusCheckTimeout": 5000,
"nodePolling": 5000,
"role": "node",
"unregisterIfStillDownAfter": 60000,
"downPollingLimit": 2
}

The color depth on MacOS is 32bit.

[ipadalko]

[aimmac23]

Hi ihorpadalko,

That doesn't look good. It sounds like the Java screenshot functionality isn't working on your system?

A quick Google doesn't reveal anything - can you send me your Java version and OS X version?

You can also set "-Djava.awt.headless=false", and see what happens.

Thanks,

Alasdair

[ipadalko]

Hi Alasdair,

This option "-Djava.awt.headless=false" helped!
The node is up and running now.
Thanks!

My java and OSX version, btw:
java version "1.8.0_141"
Sierra 10.12.5

Ihor.

[aimmac23]

Umm... I didn't expect that to really work.

I still think there's a problem somewhere, but I don't have access to a Mac to test it. I suspect there's some sort of incompatibility between the JVM and OSX - let's leave the issue open for a while in case someone else has seen the issue.