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我是一个新手，开始学习Selenium，现在在ubuntu下使用eclipse。 但在运行我的第一个程序设置驱动程序可执行文件路径的步骤是什么？
public class FirstTestCase {
public static void main(String[] args) throws InterruptedException {
// TODO Auto-generated method stub
// Create a new instance of the Firefox driver
WebDriver driver = new FirefoxDriver();
//Launch the Website
driver.get("https://www.google.com");
// Print a Log In message to the screen
System.out.println("Successfully opened the website https://www.google.com");
//Wait for 5 Sec
Thread.sleep(5);
// Close the driver
driver.quit();
}
}
，我得到这个错误，我不知道如何设置路径。我只是从github下载最新的linux版geckodriver，并将它放到我的桌面上。感谢您的帮助
Exception in thread "main" java.lang.IllegalStateException: The path
to the driver executable must be set by the webdriver.gecko.driver
system property; for more information, see
https://github.com/mozilla/geckodriver. The latest version can be
downloaded from https://github.com/mozilla/geckodriver/releases
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.firefox.GeckoDriverService.access$100(GeckoDriverService.java:38)
at org.openqa.selenium.firefox.GeckoDriverService$Builder.findDefaultExecutable(GeckoDriverService.java:91)
at org.openqa.selenium.remote.service.DriverService$Builder.build(DriverService.java:296)
at org.openqa.selenium.firefox.FirefoxDriver.createCommandExecutor(FirefoxDriver.java:245)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:220)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:215)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:211)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:124)
at automationFramework.FirstTestCase.main(FirstTestCase.java:14)