Exception in thread "main" java.lang.NoClassDefFoundError: org/openqa/selenium/remote/codec/w3c/W3CHttpCommandCodec

Question

Exception in thread "main" java.lang.NoClassDefFoundError: org/openqa/selenium/remote/codec/w3c/W3CHttpCommandCodec

Is this error because of dependencies? I inspected similar problems at Stack Overflow, but didn't came up with an idea how to fix it.

Here is my code:

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;

import org.openqa.selenium.remote.DesiredCapabilities;

import io.appium.java_client.android.AndroidDriver;
import io.appium.java_client.android.AndroidElement;
import io.appium.java_client.remote.MobileCapabilityType;

public class base {
    
    public static AndroidDriver<AndroidElement> Capabilities() throws MalformedURLException {
        
        File appdir=new File("src");
        File app=new File(appdir,"ApiDemos-debug.apk");
        
        DesiredCapabilities cap = new DesiredCapabilities();
        cap.setCapability(MobileCapabilityType.DEVICE_NAME,"Emulator1");
        cap.setCapability(MobileCapabilityType.AUTOMATION_NAME,"uiautomator2");
        cap.setCapability(MobileCapabilityType.APP, app.getAbsolutePath());
        AndroidDriver<AndroidElement> driver=new AndroidDriver<>(new URL("http://127.0.0.1:4723/wd/hub"),cap);
        return driver;
    }

This is what I see after running the test:

    авг 13, 2019 11:26:55 PM io.appium.java_client.remote.AppiumCommandExecutor$1 lambda$0
INFO: Detected dialect: W3C
Exception in thread "main" java.lang.NoClassDefFoundError: org/openqa/selenium/remote/codec/w3c/W3CHttpCommandCodec
    at io.appium.java_client.remote.AppiumCommandExecutor.execute(AppiumCommandExecutor.java:262)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552)
    at io.appium.java_client.DefaultGenericMobileDriver.execute(DefaultGenericMobileDriver.java:41)
    at io.appium.java_client.AppiumDriver.execute(AppiumDriver.java:1)
    at io.appium.java_client.android.AndroidDriver.execute(AndroidDriver.java:1)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:213)
    at io.appium.java_client.AppiumDriver.startSession(AppiumDriver.java:323)
    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:131)
    at io.appium.java_client.DefaultGenericMobileDriver.<init>(DefaultGenericMobileDriver.java:37)
    at io.appium.java_client.AppiumDriver.<init>(AppiumDriver.java:86)
    at io.appium.java_client.AppiumDriver.<init>(AppiumDriver.java:96)
    at io.appium.java_client.android.AndroidDriver.<init>(AndroidDriver.java:94)
    at base.Capabilities(base.java:22)
    at basics.main(basics.java:12)
Caused by: java.lang.ClassNotFoundException: org.openqa.selenium.remote.codec.w3c.W3CHttpCommandCodec
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 14 more

There is similar answer already stackoverflow.com/questions/56933457/… — Mykhailo Moskura
– Mykhailo Moskura, Commented Aug 13, 2019 at 21:58
Possible duplicate of java.lang.NoClassDefFoundError: org/openqa/selenium/remote/codec/w3c/W3CHttpCommandCodec — mullac
– mullac, Commented Aug 14, 2019 at 0:17
I saw this solution in some answers and that it can be set in maven but I dont know how <dependency> <groupId>io.appium</groupId> <artifactId>java-client</artifactId> <version>7.0.0</version> </dependency> <dependency> <groupId>org.seleniumhq.selenium</groupId> <artifactId>selenium-java</artifactId> <version>3.12.0</version> </dependency> — Vadim Abramenko
– Vadim Abramenko, Commented Aug 14, 2019 at 7:45
@Mykhailo Moskura - you are right, but unfortunately I have no idea about how to use maven or play with dependencies ( — Vadim Abramenko
– Vadim Abramenko, Commented Aug 14, 2019 at 8:52
You need to add dependency inside dependencies tag in pom.xml which is in root path of your project — Mykhailo Moskura
– Mykhailo Moskura, Commented Aug 14, 2019 at 9:41

Dmitri T · Accepted Answer · 2019-08-16 12:29:59Z

1

You're suffering from a form of a Jar Hell due to:

Appium Java Client 7.0.0 has Selenium Java 3.141.59 as a part of its transitive dependencies
You explicitly declare Selenium Java Client 3.12.0 as your project dependency
Java Classloading picks up the wrong classes with not matching APIs and dependencies - that's why you're getting this error

The solution is to remove Selenium Java Client 3.12.0 from your project dependencies/classpath, Maven will resolve the required dependencies on its own.

See Appium - Code Examples - Java article for more information and sample projects.

answered Aug 16, 2019 at 12:29

Dmitri T

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2 Comments

Vadim Abramenko Over a year ago

It worked after adding commons-lang3-3.7 jar and changing java-client 7.1.0 jar to 7.0.0 in external libraries. Thanks anyway!

user20468552 Over a year ago

@VadimAbramenko Hello. I have the same issue as you but still can't figure the solution. Could you please help me?

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