Jenkins UI ATH tests fail due to a org.openqa.selenium.json.JsonException

[Ullrich Hafner]

Has anybody an idea why Jenkins UI tests fail in our CI instance since a couple of days due to a org.openqa.selenium.json.JsonException?

Caused by: org.openqa.selenium.json.JsonException: Expected to read a START_MAP but instead have: END. Last 0 characters read: 
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: 'ip-172-31-21-171', ip: '172.31.21.171', os.name: 'Linux', os.arch: 'amd64', os.version: '5.8.0-1038-aws', java.version: '11.0.6'
Driver info: driver.version: RemoteWebDriver
	at org.openqa.selenium.json.JsonInput.expect(JsonInput.java:290)
	at org.openqa.selenium.json.JsonInput.beginObject(JsonInput.java:220)
	at org.openqa.selenium.json.MapCoercer.lambda$apply$1(MapCoercer.java:64)
	at org.openqa.selenium.json.JsonTypeCoercer.lambda$null$6(JsonTypeCoercer.java:145)
	at org.openqa.selenium.json.JsonTypeCoercer.coerce(JsonTypeCoercer.java:126)
	at org.openqa.selenium.json.Json.toType(Json.java:69)
	at org.openqa.selenium.json.Json.toType(Json.java:55)
	at org.openqa.selenium.json.Json.toType(Json.java:50)
	at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:112)
	... 74 more

Examples:

- https://ci.jenkins.io/job/Plugins/job/warnings-ng-plugin/job/PR-1010/1/testReport/io.jenkins.plugins.analysis.warnings/SmokeTests/linux_11___Build__linux_11____shouldRecordIssuesInPipelineAndExpandTokens/

- https://ci.jenkins.io/job/Plugins/job/git-forensics-plugin/job/master/lastCompletedBuild/testReport/io.jenkins.plugins.forensics/ForensicsPluginUiTest/linux_11___Build__linux_11____shouldAggregateToolsIntoSingleResult/

After switching from chrome-driver to firefox-driver at least Jenkins CI seems to work again (GitHub actions still fail). 

[Jonathan Mackenzie]

This could be a Selenium issue with chrome-driver.

To register a Selenium Grid Node for ChromeDriver and Chrome you need to pass the absolute path of the ChromeDriver

(from: https://stackoverflow.com/questions/52830236/org-openqa-selenium-json-jsonexception-expected-to-read-a-start-map-but-instead)

See also https://github.com/SeleniumHQ/selenium/issues/6446

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