錯誤硒節點時作爲cron作業運行

Question

，而我的硒腳本試圖通過連接到使用的crontab（如下圖所示），它已經開始節點

@reboot sh /home/selenium/automation/nodeStartUp.sh & 

運行自動化測試，我面臨着一個不尋常的錯誤

的nodeStartUp.sh內容如下所示：

#!/bin/bash 
java -jar /home/selenium/automation/selenium-server-standalone-3.0.0-beta3.jar -role node -nodeConfig /home/selenium/automation/node.json -log /home/selenium/automation/node.log 

所示的誤差是如下：（注：當我手動啓動腳本此錯誤沒有出現，並執行德stcases）

09:25:08.919 INFO [20] org.openqa.grid.internal.utils.SelfRegisteringRemote - Registering the node to the hub: http://XXX.XXX.XXX.XXX:4444/grid/register 
09:25:08.940 INFO [20] org.openqa.grid.internal.utils.SelfRegisteringRemote - The node is registered to the hub and ready to use 
09:25:10.972 INFO [17] org.openqa.selenium.remote.server.DriverServlet - Executing: [new session: Capabilities [{browserName=chrome, version=, platform=ANY}]]) 
09:25:10.972 INFO [28] org.openqa.selenium.remote.server.DefaultDriverProvider - Creating a new session for Capabilities [{browserName=chrome, version=, platform=ANY}] 
09:25:10.973 WARN [17] org.openqa.selenium.remote.server.DriverServlet - Exception thrown 
java.util.concurrent.ExecutionException: org.openqa.selenium.WebDriverException: java.lang.reflect.InvocationTargetException 
Build info: version: '3.0.0-beta3', revision: 'c7b525d', time: '2016-09-01 14:57:03 -0700' 
System info: host: 'BLR-SOFT-195', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '3.13.0-96-generic', java.version: '1.8.0_101' 
Driver info: driver.version: unknown 
     at java.util.concurrent.FutureTask.report(FutureTask.java:122) 
     at java.util.concurrent.FutureTask.get(FutureTask.java:192) 
     at org.openqa.selenium.remote.server.DefaultSession.execute(DefaultSession.java:183) 
     at org.openqa.selenium.remote.server.DefaultSession.<init>(DefaultSession.java:119) 
     at org.openqa.selenium.remote.server.DefaultSession.createSession(DefaultSession.java:95) 
     at org.openqa.selenium.remote.server.DefaultDriverSessions.newSession(DefaultDriverSessions.java:124) 
     at org.openqa.selenium.remote.server.handler.NewSession.handle(NewSession.java:59) 
     at org.openqa.selenium.remote.server.handler.NewSession.handle(NewSession.java:36) 
     at org.openqa.selenium.remote.server.rest.ResultConfig.handle(ResultConfig.java:111) 
     at org.openqa.selenium.remote.server.JsonHttpCommandHandler.handleRequest(JsonHttpCommandHandler.java:185) 
     at org.openqa.selenium.remote.server.DriverServlet.handleRequest(DriverServlet.java:204) 
     at org.openqa.selenium.remote.server.DriverServlet.doPost(DriverServlet.java:166) 
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) 
     at org.openqa.selenium.remote.server.DriverServlet.service(DriverServlet.java:132) 
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
     at org.seleniumhq.jetty9.servlet.ServletHolder.handle(ServletHolder.java:808) 
     at org.seleniumhq.jetty9.servlet.ServletHandler.doHandle(ServletHandler.java:587) 
     at org.seleniumhq.jetty9.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) 
     at org.seleniumhq.jetty9.servlet.ServletHandler.doScope(ServletHandler.java:515) 
     at org.seleniumhq.jetty9.server.handler.ContextHandler.doScope(ContextHandler.java:1061) 
     at org.seleniumhq.jetty9.server.handler.ScopedHandler.handle(ScopedHandler.java:141) 
     at org.seleniumhq.jetty9.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) 
     at org.seleniumhq.jetty9.server.Server.handle(Server.java:499) 
     at org.seleniumhq.jetty9.server.HttpChannel.handle(HttpChannel.java:310) 
     at org.seleniumhq.jetty9.server.HttpConnection.onFillable(HttpConnection.java:257) 
     at org.seleniumhq.jetty9.io.AbstractConnection$2.run(AbstractConnection.java:540) 
     at org.seleniumhq.jetty9.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) 
     at org.seleniumhq.jetty9.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) 
     at java.lang.Thread.run(Thread.java:745) 
Caused by: org.openqa.selenium.WebDriverException: java.lang.reflect.InvocationTargetException 
Build info: version: '3.0.0-beta3', revision: 'c7b525d', time: '2016-09-01 14:57:03 -0700' 
System info: host: 'BLR-SOFT-195', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '3.13.0-96-generic', java.version: '1.8.0_101' 
Driver info: driver.version: unknown 
     at org.openqa.selenium.remote.server.DefaultDriverProvider.callConstructor(DefaultDriverProvider.java:113) 
     at org.openqa.selenium.remote.server.DefaultDriverProvider.newInstance(DefaultDriverProvider.java:97) 
     at org.openqa.selenium.remote.server.DefaultDriverFactory.newInstance(DefaultDriverFactory.java:60) 
     at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call(DefaultSession.java:222) 
     at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call(DefaultSession.java:209) 
     at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
     at org.openqa.selenium.remote.server.DefaultSession$1.run(DefaultSession.java:176) 
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
     ... 1 more 
Caused by: java.lang.reflect.InvocationTargetException 
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) 
     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
     at java.lang.reflect.Constructor.newInstance(Constructor.java:423) 
     at org.openqa.selenium.remote.server.DefaultDriverProvider.callConstructor(DefaultDriverProvider.java:103) 
     ... 9 more 
Caused by: java.lang.IllegalStateException: The path to the driver executable must be set by the webdriver.chrome.driver system property; for more information, see https://github.com/SeleniumHQ/selenium/wiki/ChromeDriver. The latest version can be downloaded from http://chromedriver.storage.googleapis.com/index.html 
     at com.google.common.base.Preconditions.checkState(Preconditions.java:199) 
     at org.openqa.selenium.remote.service.DriverService.findExecutable(DriverService.java:109) 
     at org.openqa.selenium.chrome.ChromeDriverService.access$000(ChromeDriverService.java:32) 
     at org.openqa.selenium.chrome.ChromeDriverService$Builder.findDefaultExecutable(ChromeDriverService.java:137) 
     at org.openqa.selenium.remote.service.DriverService$Builder.build(DriverService.java:296) 
     at org.openqa.selenium.chrome.ChromeDriverService.createDefaultService(ChromeDriverService.java:88) 
     at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:138) 
     ... 14 more 
09:25:10.974 WARN [17] org.openqa.selenium.remote.server.DriverServlet - Exception: The path to the driver executable must be set by the webdriver.chrome.driver system property; for more information, see https://github.com/SeleniumHQ/selenium/wiki/ChromeDriver. The latest version can be downloaded from http://chromedriver.storage.googleapis.com/index.html 

任何幫助表示讚賞。

Answer 1

這似乎是一個有關chromedriver的問題。

「的驅動程序可執行文件的路徑必須由webdriver.chrome.driver系統屬性設置;有關詳細信息，請參閱https://github.com/SeleniumHQ/selenium/wiki/ChromeDriver的最新版本可從http://chromedriver.storage.googleapis.com/index.html下載。」

哪裏是你的chromedriver在什麼位置？

你在哪工作？ CentOS的？ Ubuntu的？我建議你不要在cron中運行它。相反，你可以創建一個服務，看看它的工作原理：

在/etc/systemd/system/selenium-node.service創建一個文件

添加到文件：

[Unit] 
Description=Run a selenium node 

[Service] 
ExecStart=/usr/bin/java -jar /route/to/selenium/selenium-server-standalone-2.52.0.jar -role node blablabla 
Restart=on-abort 

[Install] 
WantedBy=multi-user.target 

並運行：

sudo systemctl daemon-reload 
sudo systemctl start selenium-node.service 

或者你可以在init.d中文件的末尾加上「SH /home/selenium/automation/nodeStartUp.sh」（但太那不是最好的選擇）。

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