ClassNotFoundException: org.apache.commons.exec.DaemonExecutor

[Robert]

I'm receiving the following exception after attempting to upgrade from Selenium 2.44.0 to 2.48.2

Preparing to download artifact org.yaml#snakeyaml;1.8!snakeyaml.jar

Caught: java.lang.NoClassDefFoundError: org/apache/commons/exec/DaemonExecutor

java.lang.NoClassDefFoundError: org/apache/commons/exec/DaemonExecutor

at org.openqa.selenium.os.UnixProcess.<init>(UnixProcess.java:52)

at org.openqa.selenium.os.CommandLine.<init>(CommandLine.java:47)

at org.openqa.selenium.firefox.FirefoxBinary.startProfile(FirefoxBinary.java:97)

at org.openqa.selenium.firefox.internal.NewProfileExtensionConnection.start(NewProfileExtensionConnection.java:110)

at org.openqa.selenium.firefox.FirefoxDriver.startClient(FirefoxDriver.java:271)

at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:117)

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 AngularWebDriverExample.run(AngularWebDriverExample.groovy:11)

Caused by: java.lang.ClassNotFoundException: org.apache.commons.exec.DaemonExecutor

Any ideas as to why this dependency has become an issue within the scope of a Selenium upgrade?

[Krishnan Mahadevan]

Robert,

I cant simulate the problem. I tried a sample project by depending on 

<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-java</artifactId>
    <version>2.48.2</version>
</dependency>

and I can get Firefox to spawn successfully without any issues. I am guessing that there's something in your dependencies which is causing this problem. Have you tried creating a sample maven project which depends on just selenium and see if that works fine ? That will re-iterate that perhaps the problem lies in your dependencies.

Thanks & Regards
Krishnan Mahadevan

"All the desirable things in life are either illegal, expensive, fattening or in love with someone else!"
My Scribblings @ http://wakened-cognition.blogspot.com/

My Technical Scribbings @ http://rationaleemotions.wordpress.com/

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[darrell]

This typically happens when you have merged two projects into one or taken one project and added other things (e.g. selenium project with RESTful testing project). If one project requires an older/newer version of a dependency then other projects fail to work. Bottom line, you have something in your POM file which is conflicting with the dependencies of the Selenium tools.

[karun...@palmtreeinfotech.com]

I also faced the same error when upgraded selenium-java from 2.48 to 2.52.

The problem was solved by adding the following dependency to the pom.xml

        <dependency>

            <groupId>org.apache.commons</groupId>

            <artifactId>commons-exec</artifactId>

            <version>1.3</version>

        </dependency>