Having an ERROR: java.lang.ClassNotFoundException

Question

I'm new to coding. Currently, I am using Appium Java Eclipse.

Below is the error log.

  Nov 29, 2019 6:37:48 PM io.appium.java_client.remote.AppiumCommandExecutor$1 lambda$0
    INFO: Detected dialect: W3C
    Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils
        at io.appium.java_client.internal.ElementMap.getElementClass(ElementMap.java:77)
        at io.appium.java_client.internal.JsonToMobileElementConverter.newRemoteWebElement(JsonToMobileElementConverter.java:67)
        at org.openqa.selenium.remote.internal.JsonToWebElementConverter.apply(JsonToWebElementConverter.java:55)
        at io.appium.java_client.internal.JsonToMobileElementConverter.apply(JsonToMobileElementConverter.java:61)
        at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:561)
        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.findElement(RemoteWebDriver.java:323)
        at io.appium.java_client.DefaultGenericMobileDriver.findElement(DefaultGenericMobileDriver.java:61)
        at io.appium.java_client.AppiumDriver.findElement(AppiumDriver.java:1)
        at io.appium.java_client.android.AndroidDriver.findElement(AndroidDriver.java:1)
        at org.openqa.selenium.remote.RemoteWebDriver.findElementByXPath(RemoteWebDriver.java:428)
        at io.appium.java_client.DefaultGenericMobileDriver.findElementByXPath(DefaultGenericMobileDriver.java:151)
        at io.appium.java_client.AppiumDriver.findElementByXPath(AppiumDriver.java:1)
        at io.appium.java_client.android.AndroidDriver.findElementByXPath(AndroidDriver.java:1)
        at DemoActualAutomation.main(DemoActualAutomation.java:15)
    Caused by: **java.lang.ClassNotFoundException**: org.apache.commons.lang3.StringUtils
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)

DemoActualAutomation.class:

import java.net.MalformedURLException;
import java.util.concurrent.TimeUnit;
import io.appium.java_client.android.AndroidDriver;
import io.appium.java_client.android.AndroidElement;

public class DemoActualAutomation extends AppiumDemo {
    public static void main(String[] args) throws MalformedURLException {
        // TODO Auto-generated method stub
        AndroidDriver<AndroidElement> driver = Capabilities();
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
        driver.findElementByXPath("//android.widget.TextView[@text='Preference']").click();
    }

}

Am I missing something? Please help. Thank you!!

Is this when the program is built or when running in Eclipse ? — bbrinck
– bbrinck, Commented Nov 29, 2019 at 10:47
It would be very helpful to see your code, where this error occurs. — Andree Kröger
– Andree Kröger, Commented Nov 29, 2019 at 10:48
Below r d codes I used import java.net.MalformedURLException; import java.util.concurrent.TimeUnit; import io.appium.java_client.android.AndroidDriver; import io.appium.java_client.android.AndroidElement; public class DemoActualAutomation extends AppiumDemo{ public static void main(String[] args) throws MalformedURLException { // TODO Auto-generated method stub AndroidDriver<AndroidElement> driver=Capabilities(); driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS); driver.findElementByXPath("//android.widget.TextView[@text='Preference']").click(); — Kev
– Kev, Commented Nov 29, 2019 at 10:51
- This is when running in Eclipse. - I have commons-exec and commons-lang-2.6 on my Java Build Pat — Kev
– Kev, Commented Nov 29, 2019 at 10:54

MartenCatcher · Accepted Answer · 2020-02-20 16:02:31Z

1

From the https://commons.apache.org/proper/commons-lang/download_lang.cgi Download the commons-lang3-3.9-bin.zip
Extract locally
In Eclipse Go to your Project Properties
On the Java Build Path > Libraries Tab use the Add External JARs.
Add the Commons-lang3-3.9.jar from the extracted folder.

edited Feb 20, 2020 at 16:02

MartenCatcher

2,8858 gold badges29 silver badges41 bronze badges

answered Feb 20, 2020 at 15:44

Jerry Roldan

111 bronze badge

Sign up to request clarification or add additional context in comments.

Comments

user12672909 · Accepted Answer · 2020-03-04 05:13:44Z

1

Download the commons-lang3-3.9-bin.zip

In Eclipse, Go to your Project >Rt. Click > Build Path >Configure Build Path >Add External Jars >Select all 4 jars > Apply and Close. ur code will run...

answered Mar 4, 2020 at 5:13

user12672909

135 bronze badges

Comments

Smile · Accepted Answer · 2019-11-29 11:14:14Z

0

org/apache/commons/lang3/StringUtils indicates you are using commons-lang3. You should add commons-lang3-xxx.jar to classpath. commons-lang-2.6 doesn't have lang3 packages.

answered Nov 29, 2019 at 11:14

Smile

4,1484 gold badges30 silver badges44 bronze badges

Collectives™ on Stack Overflow

Having an ERROR: java.lang.ClassNotFoundException

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related