java.lang.IllegalStateException: The path to the driver executable must be set by the webdriver.gecko.driver system property with Selenium GeckoDriver

Question

can anyone help with the these errors or tell me what's causing them I added all the .JAR files that were in the file i downloaded from seleniumHQ.org but im still getting these errors:

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:738)
at org.openqa.selenium.remote.service.DriverService.findExecutable
(DriverService.java:111)
at org.openqa.selenium.firefox.GeckoDriverService.access100ドル
(GeckoDriverService.java:38)
at org.openqa.selenium.firefox.GeckoDriverService$Builder.findDefaultExecutable
(GeckoDriverService.java:112)
at org.openqa.selenium.remote.service.DriverService$Builder.build
(DriverService.java:302)
at org.openqa.selenium.firefox.FirefoxDriver.toExecutor(FirefoxDriver.java:233)
 at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:125)
 at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:121)
 at seleniumTakeTwo.testTutorialTwo.main(testTutorialTwo.java:11)

• Joey: You need to have a web driver for selenium to use. The one mentioned in your error is github.com/mozilla/geckodriver/releases
• JeffC: Did you read the error, follow the link, and follow the instructions there?

Answer 1

To work with Selenium 3.x with Mozila Firefox 52.0.2 you need to:

1. Download the latest gecko driver and save it in "C:\your_folder".
2. Set the System property mentioning the gecko driver along with its absolute path on your system as:

System.setProperty("webdriver.gecko.driver", "C:\\your_folder\\geckodriver.exe");

3. Next initialise the Webdriver as:

WebDriver driver = new FirefoxDriver();

4. Maximize the browser:

driver.manage().window().maximize();

5. Open an url:

driver.get("http:\\gmail.com");

Let me know if this helps you.