Firefox browser closes without opening the specified URL - selenium

Question

I am new to Selenium as can be seen by me specifying the absolute path while identifying elements. I have written a simple code for opening gmail login page which is
`
package SeleniumScripts;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.ie.InternetExplorerDriver;
public class LogintoGmail {
public static void main(String[] args) {
System.setProperty("webdriver.gecko.driver", "D:\\Selenium\\geckodriver-v0.19.1-win64\\geckodriver.exe");`enter code here`
// System.setProperty("webdriver.ie.driver", "D:\\Selenium\\IEDriverServer_x64_3.8.0\\IEDriverServer.exe");
WebDriver driver=new FirefoxDriver();
// WebDriver driver=new InternetExplorerDriver();
driver.get("http://www.gmail.com/");
driver.manage().window().maximize();
driver.findElement(By.xpath("/html/body/div[1]/div/div[2]/div/div[2]/form/div[2]/div/div/div/ul[1]/li[1]/div/div[2]/p[2]")).click();
driver.findElement(By.xpath("/html/body/div[1]/div/div[2]/div/div[2]/div/div/div[2]/div/div[1]/div/form/content/section/div/content/div[1]/div/div[1]/div/div[1]/input")).sendKeys("12!harley");
String apptitle=driver.getTitle();
System.out.println(apptitle);
}
}
`
While running the code Firefox opens & then without opening the URL closes.I am getting the below error during execution:
1541589284453 Marionette DEBUG Remote service is active
1541589284765 Marionette DEBUG Accepted connection 0 from 127.0.0.1:51510
1541589284777 Marionette TRACE 0 -> [0,1,"newSession",{"acceptInsecureCerts":true,"browserName":"firefox","capabilities":{"desiredCapabilities":{"acceptInsecureCerts":true,"browserName":"firefox"}}}]
1541589284778 Marionette TRACE 0 <- [1,1,{"error":"unknown command","message":"newSession","stacktrace":"WebDriverError#chrome://marionette/content/error.js:178: ... et#chrome://marionette/content/server.js:245:8\n_onJSONObjectReady/<#chrome://marionette/content/transport.js:490:9\n"},null]
Nov 07, 2018 4:44:45 PM org.openqa.selenium.remote.ErrorCodes toStatus
INFO: HTTP Status: '404' -> incorrect JSON status mapping for 'unknown error' (500 expected)
Exception in thread "main" org.openqa.selenium.WebDriverException: newSession
Build info: version: '3.12.0', revision: '7c6e0b3', time: '2018-05-08T15:15:03.216Z'
System info: host: 'USER-PC', ip: '192.168.43.64', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '9.0.4'
Driver info: driver.version: FirefoxDriver
remote stacktrace: WebDriverError#chrome://marionette/content/error.js:178:5
UnknownCommandError#chrome://marionette/content/error.js:472:5
despatch#chrome://marionette/content/server.js:290:13
execute#chrome://marionette/content/server.js:271:11
onPacket/<#chrome://marionette/content/server.js:246:15
onPacket#chrome://marionette/content/server.js:245:8
_onJSONObjectReady/<#chrome://marionette/content/transport.js:490:9
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.openqa.selenium.remote.W3CHandshakeResponse.lambda$new$0(W3CHandshakeResponse.java:57)
at org.openqa.selenium.remote.W3CHandshakeResponse.lambda$getResponseFunction$2(W3CHandshakeResponse.java:104)
at org.openqa.selenium.remote.ProtocolHandshake.lambda$createSession$0(ProtocolHandshake.java:123)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.base/java.util.Spliterators$ArraySpliterator.tryAdvance(Unknown Source)
at java.base/java.util.stream.ReferencePipeline.forEachWithCancel(Unknown Source)
at java.base/java.util.stream.AbstractPipeline.copyIntoWithCancel(Unknown Source)
at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
at java.base/java.util.stream.FindOps$FindOp.evaluateSequential(Unknown Source)
at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source)
at java.base/java.util.stream.ReferencePipeline.findFirst(Unknown Source)
at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:126)
at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:73)
at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:136)
at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:543)
at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:207)
at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:130)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:125)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:103)
at SeleniumScripts.LogintoGmail.main(LogintoGmail.java:12)
Please note this was running fine one week back but now i am getting error.

Answer 1

package SeleniumScripts;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.ie.InternetExplorerDriver;
public class LogintoGmail {
public static void main(String[] args) {
System.setProperty("webdriver.gecko.driver", "D:\\Selenium\\geckodriver-v0.19.1-win64\\geckodriver.exe");
WebDriver driver = new FirefoxDriver();
driver.get("http://www.gmail.com/");
driver.manage().window().maximize();
driver.findElement(By.xpath("X/PATH")).click();
driver.findElement(By.xpath("X/PATH")).sendKeys("12!harley");
String apptitle = driver.getTitle();
System.out.println(apptitle);
Try copying what i've done, the code although extremely messy was correct just you didn't have spaces when you were declaring your firefox driver, there were two instances where you didn't have proper spacing and it does make a difference.
When the code is wrong, a lot of the time the driver will force the browser open but will leave the URL empty or a null value and not continue the test.
If i was you, i would start with just opening the page and build on top of the script.