java.lang.NoClassDefFoundError: org/openqa/selenium/remote/codec/w3c/W3CHttpCommandCodec

Question

I\'m beginner in this, so be patient :) I try to launch simple test and have a problem caused by: java.lang.ClassNotFoundException: org.openqa.selenium.remote.codec.w3c.W3CHttp

Answer 1

Was facing the same issue, I just updated the selenium java client to 4.0.0-alpha-1 issue got resolved

my dependecies :

     <dependency>
        <groupId>org.testng</groupId>
        <artifactId>testng</artifactId>
        <version>6.14.3</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.seleniumhq.selenium</groupId>
        <artifactId>selenium-java</artifactId>
        <version>4.0.0-alpha-1</version>
    </dependency>


    <dependency>
        <groupId>io.appium</groupId>
        <artifactId>java-client</artifactId>
        <version>7.1.0</version>
    </dependency>

    <dependency>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.7.0</version>
    </dependency>

Answer 2

You may get this exception when you update one dependency. For example: Appium java client to latest but the dependent Selenium Java dependencies are not updated to latest then you might expect this issue. So look at your Maven dependencies of related ones.

Answer 3

You have to add a webdriver e.g.:

<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-firefox-driver</artifactId>
    <version>3.141.59</version>
</dependency>

org/openqa/selenium/remote/codec/w3c/W3CHttpCommandCodec is part of

<dependency>
   <groupId>org.seleniumhq.selenium</groupId>
   <artifactId>selenium-remote-driver</artifactId>
   <version>3.14.0</version>
</dependency>

which is a dependency from selenium-firefox-driver