How to create a test program using Firefox WebDriver with Selenium Java API?

Here is a simple test program that the Firefox WebDriver Test with the Selenium Java API:

C:\fyicenter> type FirefoxTest.java

import org.openqa.selenium.*;
import org.openqa.selenium.firefox.*;
public class FirefoxTest {
  public static void main(String[] args) {
     WebDriver driver = new FirefoxDriver();
     driver.get("http://www.google.com");
     driver.quit();
  }
}

Compile and run it with the Selenium Client JAR file:

C:\fyicenter> javac -classpath \
   \fyicenter\selenium\java\client-combined-3.141.59.jar \
   FirefoxTest.java

C:\fyicenter> java -classpath \
   .;\fyicenter\selenium\java\client-combined-3.141.59.jar;\
   \fyicenter\selenium\java\libs\guava-25.0-jre.jar;\
   \fyicenter\selenium\java\libs\okhttp-3.11.0.jar;\
   \fyicenter\selenium\java\libs\okio-1.14.0.jar;\
   \fyicenter\selenium\java\libs\commons-exec-1.3.jar \
   FirefoxTest

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:847)
   at org.openqa.selenium.remote.service.DriverService.findExecutable(DriverService.java:134)
   at org.openqa.selenium.firefox.GeckoDriverService.access$100(GeckoDriverService.java:44)
   at org.openqa.selenium.firefox.GeckoDriverService$Builder.findDefaultExecutable(GeckoDriverService.java:167)
   at org.openqa.selenium.remote.service.DriverService$Builder.build(DriverService.java:355)
   at org.openqa.selenium.firefox.FirefoxDriver.toExecutor(FirefoxDriver.java:190)
   ...

As you can see, we are missing the Mozilla GechoDriver. See next tutorial on how to fix it.

⇒ Use Firefox WebDriver with Mozilla GechoDriver

⇐ Compatibility of WebDriver Java API for Chrome

⇑ Starting with Selenium WebDriver Client Java API

⇑⇑ Selenium Tutorials