Selenium Grid: Not able to create Gecko Driver Session [duplicate] - selenium

Question

I fail to drive Firefox from Selenium with geckodriver. This is odd, because chrome is driven with same framework without errors!
These are my Version numbers:
Firefox 54.0 (64-bit)
Chrome Version 62.0.3202.94 (Official Build) (64-bit)
selenium-server-standalone-3.7.1.jar
client-combined-3.5.3-nodeps.jar
geckodriver-v0.19.1-linux64
chromedriver_linux64
Ubuntu 16.10
The error I get from Selenium webdriver with java is the following:
--------------------------------Error:
leder#leder-VirtualBox:~/Source/SeleniumCheese/bin$ ./execute_grid.sh
Exception in thread "main" org.openqa.selenium.SessionNotCreatedException: Unable to create new service: GeckoDriverService
Build info: version: '3.7.1', revision: '8a0099a', time: '2017-11-06T21:07:36.161Z'
System info: host: 'leder-VirtualBox', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '4.8.0-59-generic', java.version: '1.8.0_131'
Driver info: driver.version: unknown
Command duration or timeout: 1.39 seconds
---------------------------------Schnapp
This is my setup, where firefox is broken and chrome is OK:
Grid_SetUp.java
package de.auticon.selenium_server;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.remote.RemoteWebDriver;
import java.net.MalformedURLException;
import java.net.URL;
public class Grid_SetUp {
public static WebDriver driver;
public static void main(String[] args) throws MalformedURLException, InterruptedException{
System.setProperty("webdriver.chrome.driver","/opt/selenium/chromedriver");
String URL = "http://www.google.de";
String Node = "http://192.168.40.40:4444/wd/hub";
DesiredCapabilities cap = DesiredCapabilities.firefox();
driver = new RemoteWebDriver(new URL(Node), cap);
driver.navigate().to(URL);
WebElement element = driver.findElement(By.name("q"));
//Enter something to search for
element.sendKeys("Cheese!");
// Now submit the form. WebDriver will find the form for us from the element
element.submit();
// Check the title of the page
System.out.println("Page title is: " + driver.getTitle());
Thread.sleep(5000);
driver.quit();
}
}
selenium_grid.sh:
#!/bin/bash
java -jar /opt/selenium/selenium-server-standalone-3.7.1.jar -role hub &
java -Dwebdriver.gecko.driver=/opt/selenium/geckodriver -jar /opt/selenium/selenium-server-standalone-3.7.1.jar -role webdriver -hub http://192.168.40.40:4444/grid/register -nodeConfig /opt/selenium/defaultNodeConfig.json -browser "browserName=firefox,platform=LINUX" &
execute_grid.sh:
#!/bin/bash
java -cp ".:/opt/selenium/selenium-server-standalone-3.7.1.jar" de.auticon.selenium_server.Grid_SetUp
I updated the question for working configuration now. But when running the firefox Selenium TC the TC completes, unfortunately the server ends with an error message "session not created":
13:49:10.376 INFO - Removing session org.openqa.selenium.remote.server.ServicedSession#70c81601
13:49:10.381 INFO - To downstream: {"value":{"error":"session not created","message":"Tried to run command without establishing a connection","stacktrace":"stack backtrace:\n 0: 0x4edb3c - backtrace::backtrace::trace::hc4bd56a2f176de7e\n 1: 0x4edb72 - backtrace::capture::Backtrace::new::he3b2a15d39027c46\n 2: 0x4409a1 - webdriver::error::WebDriverError::new::h81babdd86c977032\n 3: 0x4280ea - <webdriver::server::Dispatcher<T, U>>::run::h2119c674d7b88193\n 4: 0x4029b9 - std::sys_common::backtrace::__rust_begin_short_backtrace::h21d98a9ff86d4c25\n 5: 0x40be65 - std::panicking::try::do_call::h5cff0c9b18cfdbba\n 6: 0x5e6a6c - panic_unwind::__rust_maybe_catch_panic\n at /checkout/src/libpanic_unwind/lib.rs:99\n 7: 0x41eb22 - <F as alloc::boxed::FnBox<A>>::call_box::h413eb1d9d9f1c473\n 8: 0x5df13b - alloc::boxed::{{impl}}::call_once<(),()>\n at /checkout/src/liballoc/boxed.rs:692\n - std::sys_common::thread::start_thread\n at /checkout/src/libstd/sys_common/thread.rs:21\n - std::sys::imp::thread::{{impl}}::new::thread_start\n at /checkout/src/libstd/sys/unix/thread.rs:84"}}

Answer 1

A few words about Selenium Grid Configuration:
You mentioned your Test Bed as selenium-server-standalone-3.7.1.jar and client-combined-3.5.3-nodeps.jar. As per Best Practices, you should use either of the following not both
Always try to use the latest released version i.e. selenium-server-standalone-3.7.1.jar
In selenium_grid.sh: you need to change the following :
java -Dwebdriver.gecko.driver=/opt/selenium/geckodriver

Answer 2

I simply follow this code using my firefox browser, seleinum grid with Testng in eclipse
System.setProperty("webdriver.gecko.driver","E:\\FireFoxDriver\\geckodriver.exe");
String URL = "http://demo.automationtesting.in/Register.html";
String Node = "http://192.168.43.97:4444/wd/hub";
DesiredCapabilities cap = DesiredCapabilities.firefox();
driver = new RemoteWebDriver(new URL(Node), cap);
driver.get(URL);
driver.manage().window().maximize();
System.out.println("Page title is: " + driver.getTitle());
Thread.sleep(5000);
driver.close();
For creating hub in your local machine
java -jar E:\SeleniumGrid\selenium-server-standalone-3.141.59.jar -role hub
open cmd and enter above line where your selenium standalone server is downloaded
Then you will get these two
Nodes should register to http://192.168.43.97:4444/grid/register/
Clients should connect to http://192.168.43.97:4444/wd/hub
Then again open cmd and type this for node
java -Dwebdriver.gecko.driver="E:\FireFoxDriver\geckodriver.exe" -jar E:\SeleniumGrid\selenium-server-standalone-3.141.59.jar -role node -hub http://192.168.43.97:4444/grid/register