firefox Error: no display specified

Question

1.机器环境：
CentOS release 6.8 (Final)
geckodriver-v0.24.0-linux64.tar.gz
java version "1.8.0_73"
firefox --version  Mozilla Firefox 45.0.1
2.java配置：

<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-java</artifactId>
    <version>3.6.0</version>
</dependency>

System.setProperty("webdriver.gecko.driver", "/usr/bin/geckodriver");
 

3.异常：

Driver info: driver.version: FirefoxDriver
        at org.openqa.selenium.firefox.internal.NewProfileExtensionConnection.start(NewProfileExtensionConnection.java:125)
        at org.openqa.selenium.firefox.FirefoxDriver.startClient(FirefoxDriver.java:271)
        at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:119)
        at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:216)
        at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:211)
        at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:207)
        at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:120)
        at test.GetTest.get_test(GetTest.java:57)
        at com.example.controller.SendController.sendTest(SendController.java:148)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
        at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
        at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output:
Error: no display specified

Answer 1

根据异常信息中的“Error: no display specified”，这是因为Firefox驱动无法连接到X服务器上的显示设备，需要在运行测试时指定一个有效的DISPLAY环境变量。你可以尝试在命令行中使用“export DISPLAY=:0”命令或者在程序中设置System.setProperty("DISPLAY", ":0")来设置DISPLAY变量。如果使用vnc或者ssh远程连接服务器，则需要确保你使用vnc或者ssh的X11转发选项。另外，也可以尝试使用Headless浏览器运行测试，例如PhantomJS或者无界面的Chrome浏览器。希望对你有所帮助！