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seleniumfirefoxselenium-webdrivergeckodriver

selenium could not open firefox browser says NoclassDefFound error

We are using selenium 3.0.1 with gecko driver (v0.11.1) and firefox version 49 . when we are trying to trigger firefox browser using this code 

     System.setProperty("webdriver.gecko.driver",gecko_driver_path );
     WebDriver driver = new FirefoxDriver();        
     driver.manage().window().maximize();
     return driver;

we are getting this error 

     java.lang.NoClassDefFoundError: org/openqa/selenium/remote/SessionNotFoundException
     at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:216)
     at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:211)
     at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:207)
     at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:120)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     at java.lang.reflect.Method.invoke(Method.java:497)
     at cucumber.runtime.Utils$1.call(Utils.java:37)

Please help me .

Solution

  • you have to add selenium-standalone server jar dependency as follows:

    If you are using DefaultSelenium (or the RemoteWebDriver implementation), you still need to start a Selenium server. The best way is to download the selenium-server-standalone.jar from the Selenium Downloads page and just use it. Furthermore you can also embed the Selenium server into your own project, if you add the following dependency to your pom.xml:

    <dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-server</artifactId>
    <version>3.0.1</version>
</dependency>

    Reference:

    1. http://www.seleniumhq.org/download/maven.jsp