I'm having an issue using Gradle to run Geb/Spock tests against a local 
ChromeDriver where parallel test threads intermittently throw the exception 
below. It doesn't seem to happen when I run the tests with a single thread, 
but I'm not sure that's the root cause (nor is it an acceptable solution). 
My best guess is that somehow certain threads are getting disconnected from 
ChromeDriver and defaulting to RemoteWebDriver. Has anyone else seen 
symptoms like this?

org.apache.http.conn.HttpHostConnectException: Connect to localhost:39985 
[localhost/127.0.0.1] failed: Connection refused
Build info: version: '3.4.0', revision: 'unknown', time: 'unknown'
System info: host: 'MBA-200849.local', ip: '192.168.109.63', os.name: 'Mac 
OS X', os.arch: 'x86_64', os.version: '10.12.6', java.version: '1.8.0_51'
Driver info: driver.version: RemoteWebDriver
org.openqa.selenium.WebDriverException: 
org.apache.http.conn.HttpHostConnectException: Connect to localhost:39985 
[localhost/127.0.0.1] failed: Connection refused
Build info: version: '3.4.0', revision: 'unknown', time: 'unknown'
System info: host: 'MBA-200849.local', ip: '192.168.109.63', os.name: 'Mac 
OS X', os.arch: 'x86_64', os.version: '10.12.6', java.version: '1.8.0_51'
Driver info: driver.version: RemoteWebDriver
at 
org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:91)
at 
org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:637)
at org.openqa.selenium.remote.RemoteWebDriver.get(RemoteWebDriver.java:364)
at geb.Browser.go(Browser.groovy:511)
at geb.Page.to(Page.groovy:266)
at geb.Browser.via(Browser.groovy:616)
at geb.Browser.to(Browser.groovy:570)
at geb.Browser.to(Browser.groovy:548)
at geb.Browser.to(Browser.groovy:537)
at geb.spock.GebSpec.methodMissing(GebSpec.groovy:56)
at com.craftsy.specs.ErrorSpec.check invalid url(ErrorSpec.groovy:17)
Caused by: org.apache.http.conn.HttpHostConnectException: Connect to 
localhost:39985 [localhost/127.0.0.1] failed: Connection refused
at 
org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:159)
at 
org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:359)
at 
org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
at 
org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
at 
org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at 
org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
at 
org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at 
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:72)
at 
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
at 
org.openqa.selenium.remote.internal.ApacheHttpClient.fallBackExecute(ApacheHttpClient.java:157)
at 
org.openqa.selenium.remote.internal.ApacheHttpClient.execute(ApacheHttpClient.java:87)
at 
org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:161)
at 
org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:82)
... 10 more
Caused by: java.net.ConnectException: Connection refused
at 
java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at 
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at 
java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at 
org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75)
at 
org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
... 23 more


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