Re: [geb-user] Re: Rare and intermittent RemoteWebDriver error "Unable to determine type from: <. Last 1 characters read: <"

Fri, 11 Sep 2020 09:09:20 -0700 

Hello jc,
the stacktrace seems to indicate that there is HTML being returned where JSON is expected. The "<" character is most commonly found as the first character in any HTML document. The "type" that is mentioned in the message is one of "JsonArray" or "JsonObject", starting with "[" and "{" respectively. It would be helpful to see the full response, and not only the first character, but that might not be easy to do, as the error itself is probably happening on a low level in the communication between the components of the Grid. To further investigate this, you might want to look at logfiles written by Grid components, but right now I don't know where or if there are any. 


I am guessing that there is some kind of resource leak inside the Grid, 
which leads to some component responding with a plain HTML error page, 
instead of the expected JSON document.



As a first attempt to circumvent this problem I would suggest to restart 
the whole Grid between the test runs for different resolutions.


Thomas

Am 11.09.2020 00:37 schrieb jc:

Here is the stack trace of the one that failed on the locator

Unable to determine type from: <. Last 1 characters read: <
Build info: version: '3.141.59', revision: 'e82be7d358', time:
'2018-11-14T08:17:03'
System info: host: 'redacted.corporate.redacted.com', ip:
'192.168.1.15', os.name: 'Mac OS X', os.arch: 'x86_64', os.version:
'10.14.6', java.version: '11.0.4'
Driver info: driver.version: RemoteWebDriver
org.openqa.selenium.json.JsonException: Unable to determine type from:
<. Last 1 characters read: <
Build info: version: '3.141.59', revision: 'e82be7d358', time:
'2018-11-14T08:17:03'
System info: host: 'redacted.corporate.redacted.com', ip:
'192.168.1.15', os.name: 'Mac OS X', os.arch: 'x86_64', os.version:
'10.14.6', java.version: '11.0.4'
Driver info: driver.version: RemoteWebDriver
 at org.openqa.selenium.json.JsonInput.peek(JsonInput.java:122)
 at
org.openqa.selenium.json.JsonTypeCoercer.lambda$null$6(JsonTypeCoercer.java:140)
 at
org.openqa.selenium.json.JsonTypeCoercer.coerce(JsonTypeCoercer.java:126)
 at org.openqa.selenium.json.Json.toType(Json.java:69)
 at org.openqa.selenium.json.Json.toType(Json.java:55)
 at org.openqa.selenium.json.Json.toType(Json.java:50)
 at
org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:87)
 at
org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:49)
 at
org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:158)
 at
org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552)
 at
org.openqa.selenium.remote.RemoteWebDriver.findElements(RemoteWebDriver.java:353)
 at
org.openqa.selenium.remote.RemoteWebDriver.findElementsByCssSelector(RemoteWebDriver.java:424)
 at org.openqa.selenium.By$ByCssSelector.findElements(By.java:441)
 at
org.openqa.selenium.remote.RemoteWebDriver.findElements(RemoteWebDriver.java:311)
 at
geb.navigator.SearchContextBasedBasicLocator.elementsSupplier_closure8$_closure12(SearchContextBasedBasicLocator.groovy:199)
 at groovy.lang.Closure.call(Closure.java:405)
 at groovy.lang.Closure.call(Closure.java:421)
 at
geb.navigator.SearchContextBasedBasicLocator.elementsSupplier_closure8(SearchContextBasedBasicLocator.groovy:199)
 at groovy.lang.Closure.call(Closure.java:405)
 at
geb.navigator.SearchContextBasedBasicLocator.toNavigator(SearchContextBasedBasicLocator.groovy:223)
 at
geb.navigator.SearchContextBasedBasicLocator.find(SearchContextBasedBasicLocator.groovy:186)
 at
geb.navigator.SearchContextBasedBasicLocator.find(SearchContextBasedBasicLocator.groovy:55)
 at geb.navigator.DefaultLocator.find(DefaultLocator.groovy:22)
 at geb.navigator.DefaultLocator.find(DefaultLocator.groovy:31)
 at geb.content.NavigableSupport.$(NavigableSupport.groovy:65)
 at
geb.content.PageContentTemplateFactoryDelegate.$(PageContentTemplateFactoryDelegate.groovy:27)
 at
geb.pages.EnrollmentStartPage._clinit__closure6$_closure8(EnrollmentStartPage.groovy:16)
 at
geb.pages.EnrollmentStartPage._clinit__closure6$_closure8(EnrollmentStartPage.groovy)
 at
geb.content.PageContentTemplate.invokeFactory(PageContentTemplate.groovy:102)
 at
geb.content.PageContentTemplate.create_closure1(PageContentTemplate.groovy:59)
 at
geb.content.PageContentTemplate.create_closure1(PageContentTemplate.groovy)
 at
geb.content.PageContentTemplate.create(PageContentTemplate.groovy:87)
 at geb.content.PageContentTemplate.get(PageContentTemplate.groovy:54)
 at
geb.content.DefaultPageContentSupport.getContent(DefaultPageContentSupport.groovy:42)
 at
geb.content.PageContentSupport.propertyMissing(PageContentSupport.groovy:41)
 at geb.Page.propertyMissing(Page.groovy:110)
 at
geb.pages.EnrollmentStartPage.enterCoverageEffectiveDate(EnrollmentStartPage.groovy:107)
 at geb.tests.ApplicantInformationPageTest.Applicant Information:
information is saved when proceeding and coming back to
page(ApplicantInformationPageTest.groovy:707)

On Thursday, September 10, 2020 at 5:36:05 PM UTC-5 jc wrote:


I am not sure if this is a Geb issue but hoping maybe the smart
people here could maybe help understand why I occasionally see this
error. We have a test suite of about 650 test cases that run 4
times overnight for different resolutions. So that is about 2200
tests per night. I will have occasional failures, usually 1 or 2,
with this exception:

Unable to determine type from: <. Last 1 characters read: <
Build info: version: '3.141.59', revision: 'e82be7d358', time:
'2018-11-14T08:17:03'
System info: host: 'redacted.corporate.redacted.com [1]', ip:
'192.168.1.15', os.name [2]: 'Mac OS X', os.arch: 'x86_64',
os.version: '10.14.6', java.version: '11.0.4'
Driver info: driver.version: RemoteWebDriver
org.openqa.selenium.json.JsonException: Unable to determine type
from: <. Last 1 characters read: <
Build info: version: '3.141.59', revision: 'e82be7d358', time:
'2018-11-14T08:17:03'
System info: host: 'redacted.corporate.redacted.com [1]', ip:
'192.168.1.15', os.name [2]: 'Mac OS X', os.arch: 'x86_64',
os.version: '10.14.6', java.version: '11.0.4'
Driver info: driver.version: RemoteWebDriver
at org.openqa.selenium.json.JsonInput.peek(JsonInput.java:122)
at


org.openqa.selenium.json.JsonTypeCoercer.lambda$null$6(JsonTypeCoercer.java:140)

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.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:87)

at


org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:49)

at


org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:158)

at


org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552)

at


org.openqa.selenium.remote.RemoteWebDriver.get(RemoteWebDriver.java:277)

at geb.Browser.go(Browser.groovy:533)
at geb.Browser.go(Browser.groovy:510)
at geb.spock.GebSpec.methodMissing(GebSpec.groovy:60)
at geb.BaseTest.cleanup(BaseTest.groovy:71)

In my last case I had this happen twice. The first when trying to
click an element. IntelliJ said this is the offending line of code:
pageHeader {$("div h3")[0]}

which is the first item inside a static content block on a page.

The second one the offending line was the end bracket "}" of an if
statement.

Versions of everything being used:
Grid: 3.141.59
org.seleniumhq.selenium:selenium-remote-driver:3.141.59
org.seleniumhq.selenium:selenium-server:3.141.59

org.codehaus.groovy:groovy-all:2.5.8

org.spockframework:spock-core:1.3-groovy-2.5

org.gebish:geb-spock:3.4

The remote driver is not being invoked in any obscure way:
remoteDriver = new RemoteWebDriver(URI.create(hubUrl).toURL(),
capabilities)

When this happens it's usually in the middle of a test class where
several tests before it have passed with no issues using the very
same code.

Things I know:

* It only happens when running on the grid aka with
RemoteWebDriver. I have never seen it happen locally.
* It happens once about every 2200 tests.
* It's never the same test, same method, or same action.
* It happens on both Chrome and Firefox (unsure about other
browsers).
* The message is always "Unable to determine type from: <. Last 1
characters read: <"

It almost seems as if there is a sync issue somewhere Geb or
WebDriver or something.. I am unsure how 1500+ test cases can pass
and then all of the sudden encounter this error.

I would gladly provide any help I can. Unfortunately I cannot hand
out this code for anyone to test and I don't even know what kind of
example project I could throw together to even attempt to try to
reproduce this. I am hoping the stack trace will help someone
identify something.


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